piston (music) - Hutchinson encyclopedia article about piston (music) Printer Friendly
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piston (music)

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piston

On a brass musical instrument, a valve which alters the length of tubing through which air vibrates, changing the pitch. The first valve lowers the pitch a whole tone, the second a semitone, the third three semitones. Most orchestral brass instruments today employ three valves, but sometimes a fourth is added.


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