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Playing percussion involves producing sound by striking, shaking, or scraping a wide variety of drums and idiophones. Percussion instruments are typically classified into three categories: drums, metallophones, and idiophones. They include instruments such as the timpani, snare drum, bass drum, cymbals, marimba, vibraphone, xylophone, glockenspiel, metallophone, chimes, and the triangle. Percussion players usually keep a steady beat in accompaniment to other musical parts, although they can also be used for solo and melodic purposes.