Chord sequence
Dm7 G7 Cmaj7 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 C major
Chords 1 to 3
Dm7 G7 Cmaj7
Over Dm7 · ii7
Mode 2 of Major
Over G7 · V7
Mode 5 of Major
Over Cmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.
Over A7 · V7/ii
Mode 5 of Melodic Minor