HarmoBook

Find easily any chords substitutions, for any composition and arrangement.

1 - II-7 / V7 for major chords substitutions ( II-7b5 / V7b9 for minor)

2 - Sub II-7 / Sub V7 chords substitutions major / minor

3 - IV-7 / bVII7 chords substitutions major / minor

4 - Interchange Modal Substitutions for turnaround and minor.