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| | Chicago Symphony Orchestra - Percussion instruments (Site not responding. Last check: 2007-11-04) |
 | | The heads of the mallets that the player uses to strike the bars are small, round, and hard, and may be made of plastic, rubber, wood, or metal. |
 | | Definitive statements about the origins of instruments are rare, since most instruments evolve from earlier forms, with details of the evolutionary stages often lost to history. |
 | | The length of the tube determines the pitch — the longer the tube, the lower the pitch. |
| www.cso.org /main.taf?p=1,1,4,13 (1521 words) |
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