What it does
musictheory.net provides free online music-theory lessons, beginning with notation and progressing through scales, intervals and chords.
If a score is hard to read, begin with staff notation, note duration and time signatures before moving to harmony. The lesson list makes that progression visible. A player who already reads music can instead revisit a narrower topic such as interval inversion or seventh chords. The web lessons are free; the publisher also offers separate offline lesson apps.
Sources
- musictheory.net - Lessons (Oct 26, 2026)