F♭ Phrygian — 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 · I(4)Fb(4)

Degree 2 · Degree 2G𝄫·C♭·F♭

Degree 3 · III(4)Abb(4)

Degree 4 · IV(4)Bbb(4)

Degree 5 · V(4)Cb(4)

Degree 6 · Degree 6D𝄫·G𝄫·C♭

Degree 7 · VII(4)Ebb(4)

Open in inversion explorer

I(4) · Fb(4)Degree 2 · G𝄫·C♭·F♭III(4) · Abb(4)IV(4) · Bbb(4)V(4) · Cb(4)Degree 6 · D𝄫·G𝄫·C♭VII(4) · Ebb(4)