Generally, percussion instruments are unable to sustain a long note unless repeatedly played. There are several works which cater specifically for the percussion section of the orchestra, particularly modern works.
Pitched percussion are those which produce sounds of a definite pitch - for example the xylophone, marimba, tuned chime bars, glockenspiel and timpani. For more information on tuned percussion,
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Unpitched instruments are those which are not tuned to any specific note - for example the tambourine, castanets, cymbals, woodblock, and some drums. For more information on untuned percussion,
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