The pipe organ is a
musical instrument that produces sound by forcing pressurized air (referred to as wind) through a series of
pipes. The size of pipe organs varies greatly: the smallest portable organs may have only a few dozen pipes, while the largest organs may feature tens of thousands. Organ pipes sound when a key is depressed on a
keyboard, allowing the wind to pass through one or more pipes from a chest beneath them. Because of its continuous supply of wind, the organ is capable of sustaining sound for as long as a key is depressed, unlike other keyboard instruments such as the
piano and
harpsichord, whose sound begins to decay immediately after the key is struck. Modern organs usually include one or more keyboards playable by the hands and one keyboard playable by the feet. Large organs commonly have four or five keyboards, and a few of the very largest have six or seven.
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n. หีบเพลง (syn. organ)