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105-711: The Organ Historical Society is a not-for-profit organization primarily composed of pipe organ enthusiasts interested in the instrument's design, construction, conservation and use in musical performance. Formed in 1956, the headquarters moved from Richmond, Virginia , to Villanova, Pennsylvania , in 2017. The main activities of the Society include promoting an active interest in the organ and its builders, particularly those in North America, through publishing efforts, national conventions, and preservation of library and archival materials. The Society also works to encourage

210-537: A coupler allows the pipes of one division to be played simultaneously from an alternative manual. For example, a coupler labelled "Swell to Great" allows the stops of the Swell division to be played by the Great manual. It is unnecessary to couple the pipes of a division to the manual of the same name (for example, coupling the Great division to the Great manual), because those stops play by default on that manual (though this

315-419: A fipple , like that of a recorder , whereas reed pipes produce sound via a beating reed , like that of a clarinet or saxophone. Pipes are arranged by timbre and pitch into ranks. A rank is a set of pipes of the same timbre but multiple pitches (one for each note on the keyboard), which is mounted (usually vertically) onto a windchest . The stop mechanism admits air to each rank. For a given pipe to sound,

420-432: A 4′ Octave. When both of these stops are selected and a key (for example, c′) is pressed, two pipes of the same rank will sound: the pipe normally corresponding to the key played (c′), and the pipe one octave above that (c′′). Because the 8′ rank does not have enough pipes to sound the top octave of the keyboard at 4′ pitch, it is common for an extra octave of pipes used only for the borrowed 4′ stop to be added. In this case,

525-521: A Great division may look like this: The standard position for these columns of stops (assuming drawknobs are used) is for the Choir or Positive division to be on the outside of the player's right, with the Great nearer the center of the console and the music rest. On the left hand side, the Pedal division is on the outside, with the Swell to the inside. Other divisions can be placed on either side, depending on

630-418: A central axle. Different combinations of stops change the timbre of the instrument considerably. The selection of stops is called the registration. On modern organs, the registration can be changed instantaneously with the aid of a combination action , usually featuring pistons. Pistons are buttons that can be pressed by the organist to change registrations; they are generally found between the manuals or above

735-402: A chamber generally called the swell box . At least one side of the box is constructed from horizontal or vertical palettes known as swell shades , which operate in a similar way to Venetian blinds ; their position can be adjusted from the console. When the swell shades are open, more sound is heard than when they are closed. Sometimes the shades are exposed, but they are often concealed behind

840-490: A ft=415 Hz, modern instruments at a ft=440 Hz, or Renaissance instruments at a ft=466 Hz. Modern organs are typically tuned in equal temperament , in which every semitone is 100  cents wide. Many organs that are built today following historical models are still tuned to historically-appropriate temperaments. The range (compass) of the keyboards on an organ has varied widely between different time periods and different nationalities. Portative organs may have

945-437: A full ensemble. The order in which the stops are activated is usually preset by the organ builder and the crescendo pedal serves as a quick way for the organist to get to a registration that will sound attractive at a given volume without choosing a particular registration, or simply to get to full organ. Most organs also have a piston and/or toe-stud labeled " Tutti " or " Sforzando " that activates full organ. A device called

1050-442: A half octaves, from C to g ′ ). These ranges apply to the notes written on the page; depending on the registration, the actual range of the instrument may be much greater. On most organs, at least one division will be enclosed . On a two-manual (Great and Swell) organ, this will be the Swell division (from where the name comes); on larger organs often part, or all of, the Choir and Solo divisions will be enclosed as well. Enclosure

1155-446: A horizontal row of stop tabs, a similar arrangement would be applied left to right rather than bottom to top. Among stops of the same pitch, louder stops are generally placed below softer ones (so an Open Diapason would be placed towards the bottom and a Dulciana towards the top), but this is less predictable since it depends on the exact stops available and the space available to arrange stop knobs. Thus, an example stop configuration for

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1260-409: A key is depressed. The stop action causes a rank of pipes to be engaged (i.e. playable by the keys) while a stop is in its "on" position. An action may be mechanical, pneumatic, or electrical (or some combination of these, such as electro-pneumatic). The key action is independent of the stop action, allowing an organ to combine a mechanical key action with an electric stop action. A key action in which

1365-417: A large range of timbres, organ stops exist at different pitch levels. A stop that sounds at unison pitch when a key is depressed is called an 8′ (pronounced "eight-foot") pitch. This refers to the speaking length of the lowest-sounding pipe in that rank, which is approximately eight feet (2.4 m). For the same reason, a stop that sounds an octave higher is at 4′ pitch, and one that sounds two octaves higher

1470-473: A lighter touch, and more flexibility in the location of the console, within a roughly 50-foot (15-m) limit. This type of construction was used in the late 19th century and early 20th century, and has had only rare application since the 1920s. A more recent development is the electric action, which uses low voltage DC to control the key and/or stop mechanisms. Electricity may control the action indirectly by activating air pressure valves (pneumatics), in which case

1575-431: A near horizontal position ("open"). Unlike a car accelerator pedal, a balanced expression pedal remains in whatever position it was last moved to. Historically, the enclosure was operated by the use of the ratchet swell lever , a spring-loaded lever that locks into two or three positions controlling the opening of the shutters. Many ratchet swell devices were replaced by the more advanced balanced pedal because it allows

1680-427: A payment in 1332 from the clergy of Notre Dame to an organist to perform on the feasts St. Louis and St. Michael. The Notre Dame School also shows how organs could have been used within the increased use of polyphony, which would have allowed for the use of more instrumental voices within the music. According to documentation from the 9th century by Walafrid Strabo, the organ was also used for music during other parts of

1785-415: A pedalboard with thirty or thirty-two notes (two and a half octaves, from C to f′ or g′). A coupler allows the stops of one division to be played from the keyboard of another division. For example, a coupler labelled "Swell to Great" allows the stops drawn in the Swell division to be played on the Great manual. This coupler is a unison coupler, because it causes the pipes of the Swell division to sound at

1890-579: A range of only an octave or two, while a few large organs, such as the Boardwalk Hall Auditorium Organ , may have some manual keyboards approaching the size of a modern piano. German organs of the seventeenth and eighteenth centuries featured manual ranges from C to f ′ ′ ′ and pedal ranges from C to d ′ , though some organs only had manual ranges that extended down to F. Many French organs of this period had pedal ranges that went down to AA (though this ravalement applied only to

1995-466: A row of facade-pipes or a grill. The most common method of controlling the louvers is the balanced swell pedal . This device is usually placed above the centre of the pedalboard and is configured to rotate away from the organist from a near-vertical position (in which the shades are closed) to a near-horizontal position (in which the shades are open). An organ may also have a similar-looking crescendo pedal , found alongside any expression pedals. Pressing

2100-465: A society magazine, The Tracker , and numerous publications through the OHS Press. The Tracker includes news and articles about the organ and its history, organbuilders, exemplary organs, regional surveys of instruments, and the music played on the organ. The emphasis is on American organ topics of the 18th, 19th, and 20th centuries, and there are occasional articles on European topics. The Tracker

2205-419: A stop labelled "Open Diapason 8′ " is a single-rank diapason stop sounding at 8′ pitch. A stop labelled "Mixture V" is a five-rank mixture. Sometimes, a single rank of pipes may be able to be controlled by several stops, allowing the rank to be played at multiple pitches or on multiple manuals. Such a rank is said to be unified or borrowed . For example, an 8′ Diapason rank may also be made available as

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2310-516: A warmer, richer sound than was common in the 18th century. Organs began to be built in concert halls (such as the organ at the Palais du Trocadéro in Paris), and composers such as Camille Saint-Saëns and Gustav Mahler used the organ in their orchestral works. The development of pneumatic and electro-pneumatic key actions in the late 19th century made it possible to locate the console independently of

2415-469: A water U-tube manometer , which gives the pressure as the difference in water levels in the two legs of the manometer. The difference in water level is proportional to the difference in pressure between the wind and the atmosphere. The 0.10 psi above would register as 2.75 inches of water (70  mmAq ). An Italian organ from the Renaissance period may be on only 2.2 inches (56 mm), while (in

2520-706: A way that the divisions of the organ were visibly discernible. Twentieth-century musicologists have retroactively labelled this the Werkprinzip . In France, as in Italy, Spain and Portugal, organs were primarily designed to play alternatim verses rather than accompany congregational singing . The French Classical Organ became remarkably consistent throughout France over the course of the Baroque era, more so than any other style of organ building in history, and standardized registrations developed. This type of instrument

2625-410: Is a musical instrument that produces sound by driving pressurised air (called wind ) through the organ pipes selected from a keyboard . Because each pipe produces a single pitch, the pipes are provided in sets called ranks , each of which has a common timbre , volume, and construction throughout the keyboard compass . Most organs have many ranks of pipes of differing pitch, timbre, and volume that

2730-584: Is a device that allows the sounds played on the pedals to be split, so the lower octave (principally that of the left foot) plays stops from the pedal division while the upper half (played by the right foot), plays stops from one of the manual divisions. The choice of manual is at the discretion of the performer, as is the 'split point' of the system. The system can be found on the organs of Gloucester Cathedral , having been added by Nicholson & Co (Worcester) Ltd / David Briggs and Truro Cathedral , having been added by Mander Organs / David Briggs , as well as on

2835-438: Is at 2′ pitch. Likewise, a stop that sounds an octave lower than unison pitch is at 16′ pitch, and one that sounds two octaves lower is at 32′ pitch. Stops of different pitch levels are designed to be played simultaneously. The label on a stop knob or rocker tab indicates the stop's name and its pitch in feet. Stops that control multiple ranks display a Roman numeral indicating the number of ranks present, instead of pitch. Thus,

2940-517: Is called a Positif which means portable organ.) If it is included, the Solo manual is usually placed above the Swell. Some larger organs contain an Echo or Antiphonal division, usually controlled by a manual placed above the Solo. German and American organs generally use the same configuration of manuals as English organs. On French instruments, the main manual (the Grand Orgue) is at the bottom, with

3045-465: Is credited with inventing the organ in the 3rd century BC. He devised an instrument called the hydraulis , which delivered a wind supply maintained through water pressure to a set of pipes. The hydraulis was played in the arenas of the Roman Empire . The pumps and water regulators of the hydraulis were replaced by an inflated leather bag in the 2nd century AD, and true bellows began to appear in

3150-408: Is done with super- and sub-couplers, see below). By using the couplers, the entire resources of an organ can be played simultaneously from one manual. On a mechanical-action organ, a coupler may connect one division's manual directly to the other, actually moving the keys of the first manual when the second is played. Some organs feature a device to add the octave above or below what is being played by

3255-668: Is one of the oldest instruments still used in European classical music that has commonly been credited as having derived from Greece. Its earliest predecessors were built in ancient Greece in the 3rd century BC. The word organ is derived from the Ancient Greek ὄργανον ( órganon ), a generic term for an instrument or a tool, via the Latin organum , an instrument similar to a portative organ used in ancient Roman circus games. The Greek engineer Ctesibius of Alexandria

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3360-473: Is played with at least one keyboard , with configurations featuring from two to five keyboards being the most common. A keyboard to be played by the hands is called a manual (from the Latin manus , "hand"); an organ with four keyboards is said to have four manuals. Most organs also have a pedalboard , a large keyboard to be played by the feet. [Note that the keyboards are never actually referred to as "keyboards", but as "manuals" and "pedalboard", as

3465-430: Is published quarterly, and contains many illustrations, vivid color photographs, and reprints of historic photos. Originally the focus of the society was on 18th and 19th-century tracker organs but in recent years there has been a significant expansion of interest in early-to-mid-20th century electropneumatic church and concert-hall organs. Historic restorations of theater organs are occasionally covered. The OHS Press

3570-430: Is the term for the device that allows volume control ( crescendo and diminuendo ) for a manual without the addition or subtraction of stops. All the pipes for the division are surrounded by a box-like structure (often simply called the swell box ). One side of the box, usually that facing the console or the listener, will be constructed from vertical or horizontal palettes (wooden flaps) which can be opened or closed from

3675-494: Is used to connect the console to the windchest, electric actions allow the console to be separated at any practical distance from the rest of the organ, and to be movable. Electric stop actions can be controlled at the console by stop knobs, by pivoted tilting tablets, or rocker tabs. These are simple switches, like wall switches for room lights. Some may include electromagnets for automatic setting or resetting when combinations are selected. Computers have made it possible to connect

3780-619: The urghun (organ) as one of the typical instruments of the Eastern Roman (Byzantine) Empire . It was often used in the Hippodrome in the imperial capital of Constantinople . A Syrian visitor describes a pipe organ powered by two servants pumping "bellows like a blacksmith's" played while guests ate at the emperor's Christmas dinner in Constantinople in 911. The first Western European pipe organ with "great leaden pipes"

3885-593: The Organ Reform Movement . In the late 20th century, organ builders began to incorporate digital components into their key, stop, and combination actions. Besides making these mechanisms simpler and more reliable, this also makes it possible to record and play back an organist's performance using the MIDI protocol. In addition, some organ builders have incorporated digital (electronic) stops into their pipe organs. The electronic organ developed throughout

3990-545: The musical scale . The greater the length of the pipe, the lower its resulting pitch will be. The timbre and volume of the sound produced by a pipe depends on the volume of air delivered to the pipe and the manner in which it is constructed and voiced, the latter adjusted by the builder to produce the desired tone and volume. Hence a pipe's volume cannot be readily changed while playing. Organ pipes are divided into flue pipes and reed pipes according to their design and timbre. Flue pipes produce sound by forcing air through

4095-612: The 12th century there is evidence for permanently installed organs existing in religious settings such as the Abbey of Fécamp and other locations throughout Europe. Several innovations occurred to organs in the Middle Ages, such as the creation of the portative and the positive organ. The portative organs were small and created for secular use and made of light weight delicate materials that would have been easy for one individual to transport and play on their own. The portative organ

4200-596: The 13th century, the portatives represented in the miniatures of illuminated manuscripts appear to have real keyboards with balanced keys, as in the Cantigas de Santa Maria . It is difficult to directly determine when larger organs were first installed in Europe. An early detailed eyewitness account from Wulfstan of Winchester gives an idea of what organs were like prior to the 13th century, after which more records of large church organs exist. In his account, he describes

4305-424: The 17th century, most of the sounds available on the modern classical organ had been developed. At that time, the pipe organ was the most complex human-made device —a distinction it retained until it was displaced by the telephone exchange in the late 19th century. Pipe organs are installed in churches, synagogues, concert halls, schools, mansions, other public buildings and in private properties. They are used in

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4410-418: The 20th century. Some pipe organs were replaced by digital organs because of their lower purchase price, smaller physical size, and minimal maintenance requirements. In the early 1970s, Rodgers Instruments pioneered the hybrid organ, an electronic instrument that incorporates real pipes; other builders such as Allen Organs and Johannus Orgelbouw have since built hybrid organs. Allen Organs first introduced

4515-668: The Blockwerk remained grouped together under a single stop control; these stops developed into mixtures . During the Renaissance and Baroque periods, the organ's tonal colors became more varied. Organ builders fashioned stops that imitated various instruments, such as the krummhorn and the viola da gamba . Builders such as Arp Schnitger , Jasper Johannsen, Zacharias Hildebrandt and Gottfried Silbermann constructed instruments that were in themselves artistic, displaying both exquisite craftsmanship and beautiful sound. These organs featured well-balanced mechanical key actions, giving

4620-713: The Duke University campus in 1988 or with two Pittsburgh-area organs in 2010. The organization maintains an extensive online database of historic and modern organs as well as an extensive archive of organ research materials. As of November 2018, the database held 63,913 entries for new, rebuilt, or relocated organs; 30,053 photos; and 21,512 stoplists. It includes organs built in North America (United States, Canada, and Mexico) and installed domestically or abroad, and organs built in Europe and installed in North America. The database committee solicits information to update and improve entries. The Organ Historical Society publishes

4725-619: The Eastern Roman Empire in the 6th or 7th century AD. Some 400 pieces of a hydraulis from the year 228 AD were revealed during the 1931 archaeological excavations in the former Roman town Aquincum , province of Pannonia (present day Budapest ), which was used as a music instrument by the Aquincum fire dormitory; a modern replica produces an enjoyable sound. The 9th century Persian geographer Ibn Khurradadhbih (d. 913), in his lexicographical discussion of instruments, cited

4830-567: The French manner with grander reeds and mixtures, though still without pedal keyboards. The Echo division began to be enclosed in the early 18th century, and in 1712, Abraham Jordan claimed his "swelling organ" at St Magnus-the-Martyr to be a new invention. The swell box and the independent pedal division appeared in English organs beginning in the 18th century. During the Romantic period,

4935-695: The Positif and the Récit above it. If there are more manuals, the Bombarde is usually above the Récit and the Grand Choeur is below the Grand Orgue or above the Bombarde. In addition to names, the manuals may be numbered with Roman numerals, starting from the bottom. Organists will frequently mark a part in their music with the number of the manual they intend to play it on, and this is sometimes seen in

5040-889: The Principale were 8', the "Vigesimanona" was ½'). The highest ranks "broke back", their smallest pipes replaced by pipes pitched an octave lower to produce a kind of composite treble mixture. In England, many pipe organs were destroyed or removed from churches during the English Reformation of the 16th century and the Commonwealth period. Some were relocated to private homes. At the Restoration , organ builders such as Renatus Harris and "Father" Bernard Smith brought new organ-building ideas from continental Europe. English organs evolved from small one- or two-manual instruments into three or more divisions disposed in

5145-554: The Swell super octave, which adds the octave above what is played on the Swell to itself), or act as a coupler to another keyboard (for example, the Swell super-octave to Great, which adds to the Great manual the ranks of the Swell division an octave above what is played). In addition, larger organs may use unison off couplers, which prevent the stops pulled in a particular division from sounding at their normal pitch. These can be used in combination with octave couplers to create innovative aural effects, and can also be used to rearrange

5250-419: The action is electro-pneumatic . In such actions, an electromagnet attracts a small pilot valve which lets wind go to a bellows (the "pneumatic" component) which opens the pallet. When electricity operates the action directly without the assistance of pneumatics, it is commonly referred to as direct electric action . In this type, the electromagnet's armature carries a disc pallet. When electrical wiring alone

5355-419: The amount of space available. Manual couplers and octave extensions are placed either within the stop knobs of the divisions that they control, or grouped together above the uppermost manual. The pistons, if present, are placed directly under the manual they control. To be more historically accurate, organs built along historical models will often use older schemes for organizing the keydesk controls. The organ

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5460-409: The case may be.] The collection of ranks controlled by a particular manual is called a division . The names of the divisions of the organ vary geographically and stylistically. Common names for divisions are: Like the arrangement of stops, the keyboard divisions are also arranged in a common order. Taking the English names as an example, the main manual (the bottom manual on two-manual instruments or

5565-485: The case with Echo/Antiphonal and Orchestral divisions, and sometimes it is seen with Solo and Bombarde divisions. Although manuals are almost always horizontal, organs with three or more manuals may incline the uppermost manuals towards the organist to make them easier to reach. Many new chamber organs and harpsichords today feature transposing keyboards, which can slide up or down one or more semitones. This allows these instruments to be played with Baroque instruments at

5670-473: The church service—the prelude and postlude the main examples—and not just for the effect of polyphony with the choir. Other possible instances of this were short interludes played on the organ either in between parts of the church service or during choral songs, but they were not played at the same time as the choir was singing. This shows that by this point in time organs were fully used within church services and not just in secular settings. Organs from earlier in

5775-485: The console and windchests using narrow data cables instead of the much larger bundles of simple electric cables. Embedded computers in the console and near the windchests communicate with each other via various complex multiplexing syntaxes, comparable to MIDI. The wind system consists of the parts that produce, store, and deliver wind to the pipes. Pipe organ wind pressures are on the order of 0.10 psi (0.69 kPa). Organ builders traditionally measure organ wind using

5880-424: The console. This works in a similar fashion to a Venetian blind . When the box is 'open' it allows more sound to be heard than if it were 'closed'. The most common form of controlling the level of sound released from the enclosed box is by the use of a balanced expression pedal . This is usually placed above the centre of the pedalboard , rotating away from the organist from a near vertical position ("shut") to

5985-578: The convention's host city and its surrounding area featuring a wide variety of historic pipe organs. The purpose in visiting the instruments is to appreciate, hear, and see them in their surroundings, compare them with similar instruments, and experience their aural, mechanical and visual attributes. Demonstrations are intended to showcase the instruments. There is an emphasis on organs that have not been significantly altered, enabling listeners to gain an unadulterated appreciation of representative work of historic builders. Pipe organ The pipe organ

6090-429: The corresponding keys are pressed, unlike the piano and harpsichord whose sound begins to dissipate immediately after a key is depressed. The smallest portable pipe organs may have only one or two dozen pipes and one manual; the largest organs may have over 33,000 pipes and as many as seven manuals. A list of some of the most notable and largest pipe organs in the world can be viewed at List of pipe organs . A ranking of

6195-511: The crescendo pedal forward cumulatively activates the stops of the organ, starting with the softest and ending with the loudest; pressing it backward reverses this process. Organ console Controls at the console called stops select which ranks of pipes are used. These controls are generally either draw knobs (or stop knobs), which engage the stops when pulled out from the console; stop tablets (or tilting tablets) which are hinged at their far end; or rocker-tablets, which rock up and down on

6300-452: The drum, chimes , celesta , and harp have also been imitated in organ building. The controls available to the organist, including the keyboards , couplers , expression pedals , stops, and registration aids are accessed from the console. The console is either built into the organ case or detached from it. Keyboards played by the hands are known as manuals (from the Latin mănus , meaning "hand"). The keyboard played by

6405-497: The electronic organ in 1937 and in 1971 created the first digital organ using CMOS technology borrowed from NASA which created the digital pipe organ using sound recorded from actual speaking pipes and incorporating the sounds electronically within the memory of the digital organ thus having real pipe organ sound without the actual organ pipes. A pipe organ contains one or more sets of pipes, a wind system, and one or more keyboards. The pipes produce sound when pressurized air produced by

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6510-451: The enclosure to be left at any point, without having to keep a foot on the lever. In addition, an organ may have a crescendo pedal , which would be found to the right of any expression pedals, and similarly balanced. Applying the crescendo pedal will incrementally activate the majority of the stops in the organ, starting with the softest stops and ending with the loudest, excluding only a handful of specialized stops that serve no purpose in

6615-421: The extreme) solo stops in some large 20th-century organs may require up to 50 inches (1,300 mm). In isolated, extreme cases, some stops have been voiced on 100 inches (2,500 mm). With the exception of water organs , playing the organ before the invention of motors required at least one person to operate the bellows . When signaled by the organist, a calcant would operate a set of bellows, supplying

6720-506: The feet is a pedalboard (from the Latin pēs , pĕdis , meaning "foot"). Every organ has at least one manual (most have two or more), and most have a pedalboard. Each keyboard is named for a particular division of the organ (a group of ranks) and generally controls only the stops from that division. The range of the keyboards has varied widely across time and between countries. Most current specifications call for two or more manuals with sixty-one notes (five octaves, from C to c″″) and

6825-429: The fingers. The "super-octave" adds the octave above, the "sub-octave" the octave below. These may be attached to one division only, for example "Swell octave" (the super is often assumed), or they may act as a coupler, for example "Swell octave to Great" which gives the effect while playing on the Great division of adding the Swell division an octave above what is being played. These can be used in conjunction with

6930-428: The first 32' contre-bombarde was installed in the great organ of Nancy Cathedral, France. Enclosed divisions became common, and registration aids were developed to make it easier for the organist to manage the great number of stops. The desire for louder, grander organs required that the stops be voiced on a higher wind pressure than before. As a result, a greater force was required to overcome the wind pressure and depress

7035-541: The full rank of pipes (now an extended rank ) is one octave longer than the keyboard. Special unpitched stops also appear in some organs. Among these are the Zimbelstern (a wheel of rotating bells), the nightingale (a pipe submerged in a small pool of water, creating the sound of a bird warbling when wind is admitted), and the effet d'orage ("thunder effect", a device that sounds the lowest bass pipes simultaneously). Standard orchestral percussion instruments such as

7140-556: The historic preservation and integrity of noteworthy instruments. Members consider organs in their larger context, and their audiences, builders, case designs, construction, geographical distribution, history, marketing, physical attributes, sound, and voicing receive the emphasis of attention. The society aims to be a ready resource for nonmembers seeking to discover the significance and potential avenues of restoration for instruments in their care. The society sometimes gets involved with local efforts to preserve or replace pipe organs, as on

7245-460: The keys are connected to the windchests by only rods and levers is a mechanical or tracker action . When the organist depresses a key, the corresponding rod (called a tracker) pulls open its pallet, allowing wind to enter the pipe. In a mechanical stop action, each stop control operates a valve for a whole rank of pipes. When the organist selects a stop, the valve allows wind to reach the selected rank. The first kind of control used for this purpose

7350-434: The keys. To solve this problem, Cavaillé-Coll configured the English " Barker lever " to assist in operating the key action. This is, essentially, a servomechanism that uses wind pressure from the air plenum, to augment the force that is exerted by the player's fingers. Organ builders began to prefer specifications with fewer mixtures and high-pitched stops, more 8′ and 16′ stops and wider pipe scales. These practices created

7455-465: The largest organs in the world—based on the criterion constructed by Michał Szostak , i.e. 'the number of ranks and additional equipment managed from a single console'—can be found in the quarterly magazine The Organ and in the online journal Vox Humana . The origins of the pipe organ can be traced back to the hydraulis in Ancient Greece , in the 3rd century BC, in which the wind supply

7560-405: The medieval period are evidenced by surviving keyboards and casings, but no pipes. Until the mid-15th century, organs had no stop controls. Each manual controlled ranks at many pitches, known as the "Blockwerk." Around 1450, controls were designed that allowed the ranks of the Blockwerk to be played individually. These devices were the forerunners of modern stop actions. The higher-pitched ranks of

7665-405: The middle manual on three-manual instruments) is traditionally called the Great, and the upper manual is called the Swell. If there is a third manual, it is usually the Choir and is placed below the Great. (The name "Choir" is a corruption of "Chair", as this division initially came from the practice of placing a smaller, self-contained, organ at the rear of the organist's bench. This is also why it

7770-410: The order of the manuals to make specific pieces easier to play. Enclosure refers to a system that allows for the control of volume without requiring the addition or subtraction of stops. In a two-manual organ with Great and Swell divisions, the Swell will be enclosed. In larger organs, parts or all of the Choir and Solo divisions may also be enclosed. The pipes of an enclosed division are placed in

7875-485: The organ as "the king of instruments", a characterization still frequently applied. The Halberstadt organ was the first instrument to use a chromatic key layout across its three manuals and pedalboard, although the keys were wider than on modern instruments. The width of the keys was slightly over two and a half inches, wide enough to be struck down by the fist, as the early keys are reported to have invariably been manipulated. It had twenty bellows operated by ten men, and

7980-569: The organ became more symphonic, capable of creating a gradual crescendo. This was made possible by voicing stops in such a way that families of tone that historically had only been used separately could now be used together, creating an entirely new way of approaching organ registration. New technologies and the work of organ builders such as Eberhard Friedrich Walcker , Aristide Cavaillé-Coll , and Henry Willis made it possible to build larger organs with more stops, more variation in sound and timbre, and more divisions. For instance, as early as in 1808,

8085-448: The organ with wind. Rather than hire a calcant, an organist might practise on some other instrument such as a clavichord or harpsichord . By the mid-19th-century bellows were also operated by water engines , steam engines or gasoline engines. Starting in the 1860s bellows were gradually replaced by rotating turbines which were later directly connected to electrical motors. This made it possible for organists to practice regularly on

8190-481: The organ. Most organs, both new and historic, have electric blowers , although some can still be operated manually. The wind supplied is stored in one or more regulators to maintain a constant pressure in the windchests until the action allows it to flow into the pipes. Each stop usually controls one rank of pipes, although mixtures and undulating stops (such as the Voix céleste ) control multiple ranks. The name of

8295-609: The organist precise control over the pipe speech. Schnitger's organs featured particularly distinctive reed timbres and large Pedal and Rückpositiv divisions. Different national styles of organ building began to develop, often due to changing political climates. In the Netherlands, the organ became a large instrument with several divisions, doubled ranks, and mounted cornets. The organs of northern Germany also had more divisions, and independent pedal divisions became increasingly common. Organ makers began designing their cases in such

8400-421: The organist to record performances. It also allows an external keyboard to be plugged in, which assists in tuning and maintenance. The layout of an organ console is not standardized, but most organs follow historic conventions for the country and style of organ, so that the layout of stops and pistons is broadly predictable. The stops controlling each division (see Keyboards ) are grouped together. Within these,

8505-399: The original composition, typically in pieces written when organs were smaller and only had two or three manuals. It is also common to see couplers labeled as "II to I" (see Couplers below). In some cases, an organ contains more divisions than it does manuals. In these cases, the extra divisions are called floating divisions and are played by coupling them to another manual. Usually this is

8610-403: The pallet opens, wind pressure augments tension of the pallet spring, but once the pallet opens, only the spring tension is felt at the key. This sudden decrease of key pressure against the finger provides a "breakaway" feel. A later development was the tubular-pneumatic action , which uses changes of pressure within lead tubing to operate pneumatic valves throughout the instrument. This allowed

8715-588: The pedalboard. In the latter case they are called toe studs or toe pistons (as opposed to thumb pistons). Most large organs have both preset and programmable pistons, with some of the couplers repeated for convenience as pistons and toe studs. Programmable pistons allow comprehensive and rapid control over changes in registration. Newer organs in the 2000s may have multiple levels of solid-state memory, allowing each piston to be programmed more than once. This allows more than one organist to store their own registrations. Many newer consoles also feature MIDI , which allows

8820-489: The performance of classical music, sacred music , secular music , and popular music . In the early 20th century, pipe organs were installed in theaters to accompany the screening of films during the silent movie era; in municipal auditoria, where orchestral transcriptions were popular; and in the homes of the wealthy. The beginning of the 21st century has seen a resurgence in installations in concert halls. A substantial organ repertoire spans over 500 years. The organ

8925-597: The pipe organ's establishment in Western European church music. In England, "The first organ of which any detailed record exists was built in Winchester Cathedral in the 10th century. It was a huge machine with 400 pipes, which needed two men to play it and 70 men to blow it, and its sound could be heard throughout the city." Beginning in the 12th century, the organ began to evolve into a complex instrument capable of producing different timbres . By

9030-665: The pipes, greatly expanding the possibilities in organ design. Electric stop actions were also developed, which allowed sophisticated combination actions to be created. Beginning in the early 20th century in Germany and in the mid-20th century in the United States, organ builders began to build historically inspired instruments modeled on Baroque organs. They returned to building mechanical key actions, voicing with lower wind pressures and thinner pipe scales, and designing specifications with more mixture stops. This became known as

9135-431: The player can employ singly or in combination through the use of controls called stops . A pipe organ has one or more keyboards (called manuals ) played by the hands, and a pedal clavier played by the feet; each keyboard controls its own division (group of stops). The keyboard(s), pedalboard, and stops are housed in the organ's console . The organ's continuous supply of wind allows it to sustain notes for as long as

9240-459: The portative and positive organs to the installation of larger organs in major churches such as the cathedrals of Winchester and Notre Dame of Paris. In this period, organs began to be used in secular and religious settings. The introduction of organ into religious settings is ambiguous, most likely because the original position of the Church was that instrumental music was not to be allowed. By

9345-547: The reeds, and may have only included the low AA, not AA-sharp or BB). French organs of the nineteenth century typically had manual ranges from C to g ′ ′ ′ and pedal ranges from C to f ′ ; in the twentieth century the manual range was extended to a ′ ′ ′ . The modern console specification recommended by the American Guild of Organists calls for manual keyboards with sixty-one notes (five octaves, from C to c ′ ′ ′ ′ ) and pedal keyboards with thirty-two notes (two and

9450-401: The same pitch as the keys played on the Great manual. Coupling allows stops from different divisions to be combined to create various tonal effects. It also allows every stop of the organ to be played simultaneously from one manual. Octave couplers , which add the pipes an octave above (super-octave) or below (sub-octave) each note that is played, may operate on one division only (for example,

9555-599: The sound of the organ: "among them bells outstanding in tone and size, and an organ [sounding] through bronze pipes prepared according to the musical proportions." This is one of the earliest accounts of organs in Europe and also indicates that the organ was large and more permanent than other evidence would suggest. The first organ documented to have been permanently installed was one installed in 1361 in Halberstadt , Germany. The first documented permanent organ installation likely prompted Guillaume de Machaut to describe

9660-506: The standard eight foot coupler. The super-octave may be labelled, for example, Swell to Great 4 ft; in the same manner, the sub-octave may be labelled Choir to Great 16 ft. The inclusion of these couplers allows for greater registrational flexibility and color. Some literature (particularly romantic literature from France) calls explicitly for octaves aigües (super-couplers) to add brightness, or octaves graves (sub-couplers) to add gravity. Some organs feature extended ranks to accommodate

9765-411: The standard arrangement is for the lowest sounding stops (32 ft or 16 ft) to be placed at the bottom of the columns, with the higher pitched stops placed above this, (8 ft 4 ft, 2 2 ⁄ 3 ft, 2 ft, etc.); the mixtures are placed above this (II, III, V, etc.). The stops controlling the reed ranks are placed collectively above these in the same order as above, often with the stop engraving in red. In

9870-448: The stop governing the pipe's rank must be engaged, and the key corresponding to its pitch must be depressed. Ranks of pipes are organized into groups called divisions. Each division generally is played from its own keyboard and conceptually comprises an individual instrument within the organ. An organ contains two actions, or systems of moving parts: the keys, and the stops. The key action causes wind to be admitted into an organ pipe while

9975-748: The stop reflects not only the stop's timbre and construction, but also the style of the organ in which it resides. For example, the names on an organ built in the north German Baroque style generally will be derived from the German language, while the names of similar stops on an organ in the French Romantic style will usually be French. Most countries tend to use only their own languages for stop nomenclature. English-speaking nations as well as Japan are more receptive to foreign nomenclature. Stop names are not standardized: two otherwise identical stops from different organs may have different names. To facilitate

10080-537: The top and bottom octaves when the super- and sub-couplers are engaged (see the discussion under "Unification and extension"). In a similar vein are unison off couplers, which act to "turn off" the stops of a division on its own keyboard. For example, a coupler labelled "Great unison off" would keep the stops of the Great division from sounding, even if they were pulled. Unison off couplers can be used in combination with super- and sub-couplers to create complex registrations that would otherwise not be possible. In addition,

10185-405: The unison off couplers can be used with other couplers to change the order of the manuals at the console: engaging the Great to Choir and Choir to Great couplers along with the Great unison off and Choir unison off couplers would have the effect of moving the Great to the bottom manual and the Choir to the middle manual. Another form of coupler found on some large organs is the divided pedal . This

10290-399: The wind pressure was so high that the player had to use the full strength of their arm to hold down a key. Records of other organs permanently installed and used in worship services in the late 13th and 14th centuries are found in large cathedrals such as Notre Dame , the latter documenting organists hired to by the church and the installation of larger and permanent organs. The earliest is

10395-455: The wind system passes through them. An action connects the keyboards to the pipes. Stops allow the organist to control which ranks of pipes sound at a given time. The organist operates the stops and the keyboards from the console . Organ pipes are made from either wood or metal and produce sound ("speak") when air under pressure ("wind") is directed through them. As one pipe produces a single pitch , multiple pipes are necessary to accommodate

10500-400: Was a "flue-piped keyboard instrument, played with one hand while the other operated the bellows." Its portability made the portative useful for the accompaniment of both sacred and secular music in a variety of settings. The positive organ was larger than the portative organ but was still small enough to be portable and used in a variety of settings like the portative organ. Toward the middle of

10605-433: Was a draw stop knob , which the organist selects by pulling (or drawing) toward himself/herself. Pulling all of the knobs thus activates all available pipes, and is the origin of the idiom " to pull out all the stops ". More modern stop selectors, utilized in electric actions, are ordinary electrical switches and/or magnetic valves operated by a rocker tab. Tracker action has been used from antiquity to modern times. Before

10710-686: Was created by the weight of displaced water in an airtight container. By the 6th or 7th century AD, bellows were used to supply Byzantine organs with wind. A pipe organ with "great leaden pipes" was sent to the West by the Byzantine emperor Constantine V as a gift to Pepin the Short , King of the Franks , in 757. Pepin's son Charlemagne requested a similar organ for his chapel in Aachen in 812, beginning

10815-423: Was elaborately described by Dom Bédos de Celles in his treatise L'art du facteur d'orgues ( The Art of Organ Building ). The Italian Baroque organ was often a single-manual instrument, without pedals. It was built on a full diapason chorus of octaves and fifths. The stop-names indicated the pitch relative to the fundamental ("Principale") and typically reached extremely short nominal pipe-lengths (for example, if

10920-515: Was established by the Organ Historical Society for the advancement and dissemination of scholarship about the organ, its music, literature, cultural contexts, and performance. The OHS Press accepts for publication material regardless of commercial viability if it supports the society's goals. The Organ Historical Society hosts annual conventions. Over the course of a week, attendees may attend numerous concerts in various venues in

11025-466: Was sent from Constantinople to the West by the Byzantine emperor Constantine V as a gift to Pepin the Short King of the Franks in 757. Pepin's son Charlemagne requested a similar organ for his chapel in Aachen in 812, beginning its establishment in Western European church music. From 800 to the 1400s, the use and construction of organs developed in significant ways, from the invention of

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