Root
Chord tone
Extension or alteration
L/R under a key: left or right hand
The inversion toggle re-voices every card. Two-hand voicings stay fixed.
Pick a root, then read every chord type on it: the formula, the notes spelled for that key, what it is used for, and the keys to press. The sevenths, extended and altered chords also get a two-hand voicing, the root and the 7th in the left hand. Tap or press Enter on a card to hear it. Your root, family and inversion are remembered in this browser. To see the chord you are playing named as you play it, try the piano viz.