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| | Percussion Instruments - MSN Encarta |
 | | Another type of pitched drum in the orchestra is the roto-tom (a modern development of the unpitched tom-tom, in which the drums can be tuned to a precise pitch by rotating the drum head). |
 | | Other pitched percussion instruments include the celesta (played with a keyboard like a piano), the tubular bells (played with leather or plastic beaters), and the mallet instruments: the glockenspiel and vibraphone (both made of metal bars), the crotales (of metal discs), and the xylophone and marimba (both of wooden bars). |
 | | Instruments without pitch used in the orchestra include a range of drums, the most prominent of which are the snare drum (or side drum), tenor drum (military in origin like the side drum, but without snares), and the bass drum. |
| uk.encarta.msn.com /encyclopedia_761561835/Percussion_Instruments.html (812 words) |
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