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In music, the organ (from Greek ???a??? organon, "organ, instrument, tool")[1] is a keyboard instrument of one or more pipe divisions, each played with its own keyboard, played either with the hands on a keyboard or with the feet using pedals. The organ is a relatively old musical instrument,[2] dating from the time of Ctesibius of Alexandria (285–222 BC), who invented the water organ. It was played throughout the Ancient Greek and Ancient Roman world, particularly during races and games.[3] During the early medieval period it spread from the Byzantine Empire, where it continued to be used in secular (non-religious) and imperial court music, to Western Europe, where it gradually assumed a prominent place in the liturgy of the Catholic Church.[3] Subsequently it re-emerged as a secular and recital instrument in the Classical music tradition.

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