Chord sequence
C7 F7 B♭7 E♭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 Ab major
All the chords
Dominant 7th chords around the cycle of fifths, each the V of the next, from III7 to V7 and home to I.
Over C7 · V7/VI
Mode 6 of Blues
Over F7 · V7/II
Over Bb7 · V7/V
Mode 5 of Major
Over Eb7 · V7
Over Abmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.