Question

what Is a triangle shaped tool/object that has a metal needle that musicians use to learn timing?

Answer 1

Answer:

Metronome

Explanation:

A metronome, from ancient Greek  (métron, "measure") and (némo, "I manage", "I lead"), is a device that produces an audible click or other sound at a regular interval that can be set by the user, typically in beats per minute (BPM). Musicians use the device to practice playing to a regular pulse. Metronomes typically include synchronized visual motion (e.g., swinging pendulum or blinking lights).

Answer 2

Heyya

Metronome is the answer