Chord sequence
C7 F7 B♭7 G♭7 A♭maj7
In every key
Four-note rootless voicings in their two forms, with the 3rd or the 7th on the bottom, played over the root.
Heard in F major
Over C7 · V7
Mode 5 of Major
Over F7 · V7/IV
Over Bb7 · IV7
Mode 4 of Melodic Minor
Over Gb7 · ?
Mode 6 of Blues
Over Abmaj7 · ♭IIImaj7
Mode 4 of Major