Chord training

Pass a level to advance. Mastery tracks are optional. Finish them all to master a level.

Major & minor triads
Root-position major and minor triads.
Slash chords — triads
Triads over a foreign bass note — two hands, bass note lowest.
Diminished & augmented
Diminished and augmented triads across all twelve roots.
Sus chords
Suspended 2nds and 4ths — neither major nor minor.
Seventh chords
Major 7, minor 7, and dominant 7 chords across all twelve roots.
Diminished 7ths
Fully and half-diminished 7ths, plus passing dim7s.
7th voicing — Drop 2
Seventh chords in the drop-2 voicing.
Slash chords — 7ths
Seventh chords over a foreign bass note — two hands.
6 chords
Major and minor 6th chords (C6 shares its notes with Am7).

Mastery band = a level’s 1–3 optional tracks; the number is your progress toward the pass mark. Finish every track for ★ Mastered. Switch tracks and keys inside the level. Lock with a message = earn it by playing.

Penny Pro

Unlock the whole keyboard.

Every level: 7th chords, extensions and beyondAll 12 keys in every scale-degree trackEvery mastery track, on every level you unlock
$6/month · or $48/year

Pro levels still unlock by playing. Pro never skips the ladder.