Percussion instruments are large group of instruments that produce sound by being struck , shaken , scraped, or clashed together. Most percussion instruments - such as the tam-tam (gong) , cymbals , and maracas - do not have a definite pitch and are used for rhythm and impact , and the distinctive timbre ( colour) of their sound. Other percussion instruments such as the xylophone , vibraphone , and tubular bells - are tuned to a definite pitch that can play melody , harmony , and rhythms . The xylophone and vibraphone each have two rows of bars that are arranged in a similar way to the black and white keys of a piano. Metal tubes are suspended below the bars to amplify the sound. The vibraphone has electrically operated fans that rotate in the tubes and produce a vibrato (wavering pitch) effect.
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