Diminished Triad (vii
, B dim)
Lower the 3rd & 5th of a major triad ½ step
Raise the root of a major triad ½ step
2 minor 3rds
Major scale degrees 7 - 2 - 4 (ti - re - fa)
Augmented Triad (V
, G aug)
Raise the 5th of a major triad ½ step
2 major 3rds
Major scale degrees 5 - 7 - raised 2 (sol - ti - ri)
Easy Keyboard Harmony. Book 1.
Pages 16-31 use diminished and augmented triads.