Chord sequence
E♭m7 G♯7 Em7 A7
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
Chords 1 to 2
Ebm7 G#7
Chords 3 to 4
Em7 A7
Over Ebm7 · ♭ii7
Mode 6 of Blues
Over G#7 · V7/vii
Over Em7 · ii7
Mode 2 of Major
Over A7 · V7
Mode 5 of Major