Chord sequence
Dm7♭5 D♭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 C major
Over Dm7b5 · iiø7
Mode 2 of Harmonic Minor
Over Db7 · subV7
Mode 4 of Melodic Minor
Over Cmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.