Chord sequence
Cm7 Am7♭5 Dm7♭5 D♭7♯11
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 C minor
Over Cm7 · i7
Mode 2 of Major
Over Am7b5 · viø7
Mode 7 of Major
Over Dm7b5 · iiø7
Over Db7#11 · subV7♯11
Mode 4 of Melodic Minor