50 exercises and 50 audio tracks to learn to play the essential chords in twelve keys with chord sequences. Chords : C, D, E, F, G, A, B, C7, D7, E7, F7, G7, A7, B7, C#, D#, F#, G#, A#, C#7, D#7, F#7, G#7, A#7, Cm, Dm, Em, Fm, Gm, Am, Bm, Cm7, Dm7, Em7, Fm7, Gm7, Am7, Bm7, C#m, D#m, F#m, G#m, A#m, C#m7, D#m7, F#m7, G#m7, A#m7.