Organ

The organ (from Greek όργανον – organon, "organ, instrument, tool") is a keyboard instrument played using one or more manual and a pedalboard. It uses wind moving through metal or wood pipes to produce sound, which remains constant while a key is depressed. Its sounds, which vary widely in timbre and volume, are divided according to ranks and controlled by the use of stops. The keyboard is not expressive and does not affect dynamics. Organs vary greatly in size, ranging from a cubic yard to a height reaching five floors , and are located primarily in churches, concert halls, and homes. The organ is one of the oldest musical instrument in the Western musical tradition, and carries a rich history connected with Christian liturgy and civic ceremony. The term "organ" may be applied to a variety of instruments which do not have all of the traits listed above. The most well-known and original type of organ is the pipe organ which is used in many church services and classical music concerts... full article at wikipedia