Chord sequence
Em7♭5 E♭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 F major
Over Em7b5 · viiø7
Mode 7 of Major
Over Eb7#11 · ♭VII7♯11
Mode 4 of Melodic Minor