This Helps Piano Students Keep the Pace
Puzzle 11 of Running a Marathon Pack
Question is: This Helps Piano Students Keep the Pace
and the answer is: METRONOME
Word Meaning:
METRONOME — (music) A device, containing an inverted pendulum, used to mark time by means of regular ticks at adjustable intervals; an electronic equivalent that emits flashes.
Definitions from Wiktionary.