Chord sequence
Am7 D7 D♯dim7 Em7
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 E minor
Chords 1 to 2
Am7 D7
Over Am7 · iv7
Mode 2 of Major
Over D7 · ♭VII7
Mode 5 of Major
Over D#dim7 · vii°7
Mode 7 of Harmonic Minor
Over Em7 · i7