← A♭ Altered on Soprano Saxophone
A♭ 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 1A♭·D𝄫·G♭
Degree 2 · Degree 2B𝄫·E𝄫·A♭
Degree 3 · III(4)Cb(4)
Degree 4 · Degree 4D𝄫·G♭·C♭
Degree 5 · Degree 5E𝄫·A♭·D𝄫
Degree 6 · VI(4)Fb(4)
Degree 7 · VII(4)Gb(4)