Chord sequence
Cm7 F7 B♭maj7 G7
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 Bb major
Chords 1 to 3
Cm7 F7 Bbmaj7
Over Cm7 · ii7
Mode 2 of Major
Over F7 · V7
Mode 5 of Major
Over Bbmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.
Over G7 · V7/ii
Mode 5 of Melodic Minor