19.1 Triads
 29.2 Major chords
 39.3 Minor chords
 49.4 Diminished chords
 59.5 Augmented chords
 69.6 Seventh chords
 79.7 Inversions
 89.8 Diatonic chords
 99.9 Roman numerals
109.10 Common progressions
119.11 Voice leading

1I-V-vi-IV
2I-IV-V
3ii-V-I
4I-vi-IV-V
512-bar blues
6vi-IV-I-V
7i-VII-VI-VII

1Chord:
2Notes:
3Piano shape:
4Guitar shape:
5Inversions:
6Progressions using it:
7Songs using it:
8Sound: