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percussion instrument, any musical instrument belonging to either of two groups, idiophones or membranophones. Idiophones are instruments whose own substance vibrates to produce sound (as opposed to the strings of a guitar or the air column of a flute); examples include bells, clappers, and rattles. Membranophones emit sound by the vibration of a stretched membrane; the prime examples are drums. The term percussion instrument refers to the fact that most idiophones and membranophones are sounded...