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13 points
METRONOME is validvalid
[n METRONOMES]
a mechanical device which indicates the exact tempo of a piece of music by producing a clicking sound from a pendulum with an adjustable period of swing [n -S]
[n METRONOMES]
a mechanical device which indicates the exact tempo of a piece of music by producing a clicking sound from a pendulum with an adjustable period of swing [n -S]