Chord sequence
Bm7 E7 Am7 D7 Gm7 C7 Dmaj7
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 D major
All the chords
Three ii-Vs, each a whole step below the last and the last one the backdoor ii-V: a chain of keys that doesn't arrive until the end.
Over Bm7 · vi7
Mode 6 of Major
Over E7 · V7/v
Mode 5 of Melodic Minor
Over Am7 · ii7/iv
Mode 2 of Major
Over D7 · V7/iv
Over Gm7 · iv7
Over C7 · ♭VII7
Mode 4 of Melodic Minor
Over Dmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.