Chord sequence
E♭m7 Cm7♭5 Fm7♭5 E7♯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 Eb minor
Over Ebm7 · i7
Mode 2 of Major
Over Cm7b5 · viø7
Mode 7 of Major
Over Fm7b5 · iiø7
Over E7#11 · subV7♯11
Mode 4 of Melodic Minor