Chord sequence
A♭maj7 F7 D♭m7 G♭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 Ab major
Chords 3 to 4
Dbm7 Gb7
Over Abmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.
Over F7 · V7/ii
Mode 6 of Blues
Over Dbm7 · iv7
Mode 2 of Major
Over Gb7 · ♭VII7
Mode 4 of Melodic Minor