Key (instrument)
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A key is a specific part of a musical instrument. The purpose and function of the part in question depends on the instrument.
On instruments equiped with tuning machines, violins and guitars, for example, a key is part of a tuning machine. It is a worm gear with a key shaped end used to turn a cog, which, in turn, is attached to a post which winds the string. The key is used to make pitch adjustments to a string.
With other instruments, zithers and drums, for example, a key is essentially a small wrench used to turn a tuning machine or lug.
On woodwind instruments such as a flute or saxophone, keys are levers used to open or close a hole that could not be operated directly by a finger.
On other instruments, particularly keyboard instruments, a key is a button which is pressed to cause a note to sound, either mechanically, as on a piano, or electrically, as on a synthesizer.
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