B♭ 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 1B♭·E𝄫·A♭

Degree 2 · Degree 2C♭·F♭·B♭

Degree 3 · III(4)Db(4)

Degree 4 · Degree 4E𝄫·A♭·D♭

Degree 5 · Degree 5F♭·B♭·E𝄫

Degree 6 · VI(4)Gb(4)

Degree 7 · VII(4)Ab(4)

Open in inversion explorer

Degree 1 · B♭·E𝄫·A♭Degree 2 · C♭·F♭·B♭III(4) · Db(4)Degree 4 · E𝄫·A♭·D♭Degree 5 · F♭·B♭·E𝄫VI(4) · Gb(4)VII(4) · Ab(4)