Chord sequence
Dm7 Gm7 Dm7 B♭7 A7alt Dm7 Em7♭5 A7alt
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 minor
All the chords
The 12-bar blues in a minor key: minor 7ths on i and iv, and a bVI7 falling by half step to an altered V7 in bars 9 and 10.
Chords 7 to 8
Em7b5 A7alt
Over Dm7 · i7
Mode 2 of Major
Over Gm7 · iv7
Over Bb7 · ♭VI7
Mode 4 of Melodic Minor
Over A7alt · V7alt
Mode 7 of Melodic Minor
Over Em7b5 · iiø7
Mode 7 of Major