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