15027 / 18210 · Workshop 113 — Writing Original Chord Progressions: Functional Logic, Voice-Leading Logic, Modal Logic, and How to Avoid “Chord Collection” Syndrome← prev⊞ allnext →
113.95Level 72 — common-tone percentage
Compare chords:
Cmaj7: C E G B.
Em7: E G B D.
Three common tones.
Very close.
Cmaj7→D♭7: almost none, depending extensions.
Farther.
You can design harmonic distance through common-tone count.