Chord sequence
E♭7 A♭7 E♭7 A♭7 E♭7 Fm7 B♭7 E♭7 Fm7 B♭7
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 Eb major
Chords 6 to 7
Fm7 Bb7
Chords 9 to 10
Over Eb7 · V7/IV
Mode 5 of Major
Over Ab7 · IV7
Mode 4 of Melodic Minor
Over Eb7 · I7
Over Fm7 · ii7
Mode 2 of Major
Over Bb7 · V7