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)C(4)
Degree 4 · Degree 4D♭·G·C
Degree 5 · Degree 5E♭·A·D♭
Degree 6 · VI(4)F(4)
Degree 7 · VII(4)G(4)