Chord sequence
A♭m7 D♭7 G♭maj7 E♭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 Gb major
Chords 1 to 3
Abm7 Db7 Gbmaj7
Over Abm7 · ii7
Mode 2 of Major
Over Db7 · V7
Mode 5 of Major
Over Gbmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.
Over Eb7 · V7/ii
Mode 5 of Melodic Minor