D♭ 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 1D♭·G𝄫·C♭
Degree 2 · Degree 2E𝄫·A𝄫·D♭
Degree 3 · III(4)Fb(4)
Degree 4 · Degree 4G𝄫·C♭·F♭
Degree 5 · Degree 5A𝄫·D♭·G𝄫
Degree 6 · VI(4)Bbb(4)
Degree 7 · VII(4)Cb(4)