Pipe organ is a musical instrument that produces sound when pressurized air is driven through a series of pipes.
The admission of wind into the pipes is controlled by a keyboard. A pipe sounds when a key is depressed on the keyboard, allowing wind to pass through the pipe. Modern organs usually include keyboards playable by the hands and one keyboard playable by the feet. Each keyboard controls a certain number of pipes. The smallest portable organs may have only a few dozen pipes and only one keyboard, while the largest organs may feature over 20,000 pipes and seven keyboards. The organ's continuous supply of wind allows it to sustain sound for as long as a key is depressed. This is unlike other keyboard instruments such as the piano and harpsichord, whose sound begins to decay immediately after the key is struck.
Pipe-organs are to be found mainly in churches, cathedrals, synagogues, theatres, and in large homes.
Grand organ, or a building´s main organ: generally elevated, their size can vary greatly.
Choir organ: generally a smaller instrument often placed on the floor, in fairly close proximity to the altar.
Accompanying organ: a smaller instrument with more limited musical possibilities, with mainly artistic interest, elevated or placed on the floor.
Study organ: an instrument that comes in various sizes and installed in auditoriums or study rooms in music conservatoriums.
Theatre organ: a rare instrument built for a theatre.
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