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| | Musical Instruments |
 | | The different pitches on most stringed instruments are obtained either by having many strings of different lengths, as on a harp, or by changing the vibrating length of strings by stopping them at different points, as on a violin or guitar. |
 | | The pitch of a brass instrument depends on the volume of air that is vibrating, as well as the speed at which the player's lips vibrate. |
 | | In general this means that the instruments must have a different vibrating body for each note, such as xylophone bars, chimes, bells, or the tuned gongs of a gamelan orchestra. |
| www.exhibits.pacsci.org /music/Instruments.html (1280 words) |
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