Chord sequence
Bmaj7 Cdim7 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 B major
Chords 3 to 4
Em7 A7
Over Bmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.
Over Cdim7 · ♭ii°7
Mode 7 of Harmonic Minor
Over Em7 · iv7
Mode 2 of Major
Over A7 · ♭VII7
Mode 4 of Melodic Minor