Chord sequence
B♭7 E♭7 A♭7 E7 G♭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 Eb major
Over Bb7 · V7
Mode 5 of Major
Over Eb7 · V7/IV
Over Ab7 · IV7
Mode 4 of Melodic Minor
Over E7 · ?
Mode 6 of Blues
Over Gbmaj7 · ♭IIImaj7
Mode 4 of Major