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A mechanical wind-up metronome in motion

A metronome is a device that produces a strict rhythm. Musicians use metronomes when they practice in order to keep a standard tempo; ie, keep a steady beat throughout the music. Even in pieces that do not require strict time (see rubato[?]), a metronome is used to give an indication of the general tempo intended by the composer. Many pieces give a tempo indication at the top of the manuscript.

One common type of metronome is the wind-up metronome, which uses a weight on the end of a rod to control the tempo. The rod swings back and forth in tempo; mechanics inside the metronome produce a clicking sound on each swing of the rod.

Most newer metronomes are electronic. The simplest electronic metronomes have a dial or buttons to control the tempo; some can also produce a tuning note (usually A, 440 hertz). The button forms range from simple credit-card sized devices to the complicated "Dr. Beat", manufactured by Boss. In addition to a simple pulse, this metronome can play polyrhythms and can "count aloud", using a sampled voice.

External Link

An example of a Dr. Beat (http://www.mcneilsmusic.com/bostaldrbeat)

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