Chord sequence
Dm7 Bm7♭5 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 I-vi-ii-V of a minor key: the minor i, a half-diminished vi and ii, and an altered V.
Over Dm7 · i7
Mode 2 of Major
Over Bm7b5 · viø7
Mode 7 of Major
Over Em7b5 · iiø7
Over A7alt · V7alt
Mode 7 of Melodic Minor