Chord sequence
Em7 A7 Dmaj7 B7
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 D major
Chords 1 to 3
Em7 A7 Dmaj7
Over Em7 · ii7
Mode 2 of Major
Over A7 · V7
Mode 5 of Major
Over Dmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.
Over B7 · V7/ii
Mode 5 of Melodic Minor