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 by being struck, although other playing methods include rubbing, shaking, plucking, and scraping.
Some of the percussion instruments of the Western orchestra (clockwise, from top): xylophone, gong,
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Although many idiophones and some membranophones are tunable and hence may be melody instruments, both groups serve typically to delineate or emphasize rhythm. Percussion instruments form the third section of the modern Western orchestra, stringed and wind instruments making up the other two sections. The term percussion instrument dates to 1619, when the German music theorist and composer Michael Praetorius wrote of percussa, klopfende Instrument (German klopfen, to beat), as any struck instrument, including struck chordophones (stringed instruments). The same combination, including prebow chordophones, constituted the divisio rhythmica in the 7th-century Etymologiae of Isidore, archbishop of Sevilla (Seville).
Classification > Idiophones
Idiophones form a diverse and disparate group. Concussion instruments, consisting of two similar components struck together, include clappers, concussion stones, castanets, and cymbals. Percussion idiophones, instruments struck by a nonsonorous striker, form a large subgroup, including triangles and simple percussion sticks; percussion beams, such as the semanterion; percussion disks and plaques, single and in sets; xylophones, lithophones (sonorous stones), and metallophones (sets of tuned metal bars); percussion tubes, such as stamping tubes, slit drums, and tubular chimes; and percussion vessels varying from struck gourds and pots to gongs, kettle gongs, steel drums, bells, and musical cups.
Bronze Egyptian sistrum, dated after 850 BC (crossbars and jingles are modern); in the British
Courtesy of the trustees of the British Museum, London
Shaken idiophones, or rattles, include vessels filled with rattling material, such as gourd, basketry, and hollow-ring rattles, as well as pellet bells; strung rattles, such as dancers' leg rattles or anklets; stick rattles, including the sistrum, originally a forked stick with crossbars on which rattling shells, etc., have been strung; pendant rattles with suspended rattling objects; and sliding rattles.
Other categories include scraped idiophones, comprising scrapers and cog rattles; split idiophones made of split hollow cane, including the Southeast Asian tuning fork idiophones and the chopstick; plucked idiophones, such as the Jew's harp, mbira, and music box; friction idiophones, including friction sticks, simple or combined, and musical glasses; and blown idiophones, such as the 19th-century Äolsklavier and piano chanteur.
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