Chord sequence
F♭maj7 D♭m7 Am7 D7
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 Fb major
Chords 3 to 4
Am7 D7
Over Fbmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.
Over Dbm7 · vi7
Mode 6 of Major
Over Am7 · iv7
Mode 2 of Major
Over D7 · ♭VII7
Mode 4 of Melodic Minor