Reference

Theory tools — scales, chords and every way to voice them, and the circle of fifths.

Chord explorer

Build any chord — including add and altered tones — and see every way to play it.

Amber = potential clash

Circle of fifths

Adjacent keys differ by a single note — pick your modulation target.

Scale explorer

See the notes, their intervals, and any scales with the same pitch set.

Pick a scale to explore its intervals and related scales.