Resources

Tools and reading for learning to play, free like everything else here. They run in your browser, on a phone too, and need nothing installed.

Guitar Chord Atlas

42 chord types in all 12 keys, from power chords to altered dominants. Several movable voicings on each, inversions, open shapes, the formula and the notes of each, and the fingers, intervals or note names on every dot.
Six strings / 42 chords / 12 keys
Piano Chord Atlas

The same 34 chord types on a keyboard, in root position or any inversion, with two-hand voicings for the sevenths and up and a fingering for each. Tap a card to hear it.
Inversions / two hands / sound