Rhythm-reading trainer

Render standard rhythm notation (quarter, eighth, sixteenth, rests, ties) from a small text format

A metronome with a count-in, using the Web Audio clock, not setTimeout

Capture taps and score each against the expected onset with a tolerance window

Difficulty levels that introduce syncopation and triplets

A game mode: ten bars, a score, your accuracy trend

Detect that the user is consistently early or late and say so

Requirements