Chord sequence
E7 A7 D7 B♭7 Cmaj7
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 A major
Over E7 · V7
Mode 5 of Major
Over A7 · V7/IV
Over D7 · IV7
Mode 4 of Melodic Minor
Over Bb7 · ?
Mode 6 of Blues
Over Cmaj7 · ♭IIImaj7
Mode 4 of Major