metronome
/ˈmɛtrəˌnoʊm/
noun
- A device that produces a regular, repeating sound (such as a tick or beep) to help musicians keep a steady tempo while playing.
- The piano teacher set the metronome to 120 beats per minute for the practice piece.
- She used a metronome to improve her sense of rhythm on the guitar.
- The metronome ticked steadily as the orchestra rehearsed the fast section.