← C♭ Altered on Viola (treble clef)
C♭ Altered — Quartal voicings
Three-note stacks of fourths, one per scale degree — the open, ambiguous voicing-flavour McCoy Tyner and Bill Evans built modal-era jazz around (the 'So What' chord).
All 7 quartal voicings in sequence
Degree 1 · Degree 1C♭·F𝄫·B𝄫
Degree 2 · Degree 2D𝄫·G𝄫·C♭
Degree 3 · III(4)Ebb(4)
Degree 4 · Degree 4F𝄫·B𝄫·E𝄫
Degree 5 · Degree 5G𝄫·C♭·F𝄫
Degree 6 · VI(4)Abb(4)
Degree 7 · VII(4)Bbb(4)