Chord sequence
Fm7 B♭7 Em7 A7 E♭m7 A♭7 D♭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 Db major
All the chords
ii-Vs falling by half steps: iii-VI, the ii-V a half step lower, then ii-V-I.
Over Fm7 · iii7
Mode 6 of Major
Over Bb7 · V7/ii
Mode 6 of Blues
Over Em7 · ♭iii7
Mode 2 of Major
Over A7 · ♭VI7
Mode 4 of Melodic Minor
Over Ebm7 · ii7
Over Ab7 · V7
Mode 5 of Major
Over Dbmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.