| |
| | percussion instrument |
 | | Percussion instruments can be divided into those that can be tuned to produce a sound of definite pitch, such as the timpani, tubular bells, glockenspiel, xylophone, and piano, and those of indefinite pitch, including the bass drum, tambourine, triangle, cymbals, castanets, and gong. |
 | | The timpano is a large hemispherical bowl of metal with a membrane stretched across the rim, affixed and tuned by screwtaps or with a pedal mechanism; tubular or orchestral bells are vertically suspended on a frame and struck at the top end with mallets. |
 | | These instruments were often used by Witold Lutoslawski in his orchestral works; the glockenspiel is a small keyboard of aluminium alloy keys played with small beaters; the xylophone has hardwood, rather than metal, bars, and is played using hard-headed beaters to give a distinctive pop to the sound. |
| www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0012323.html (306 words) |
|