Chord sequence
Em7 A7 A♯dim7 Bm7
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 B minor
Chords 1 to 2
Em7 A7
Over Em7 · iv7
Mode 2 of Major
Over A7 · ♭VII7
Mode 5 of Major
Over A#dim7 · vii°7
Mode 7 of Harmonic Minor
Over Bm7 · i7