Chord sequence
D7 G7 C7 F7 B♭maj7
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
All the chords
Dominant 7th chords around the cycle of fifths, each the V of the next, from III7 to V7 and home to I.
Over D7 · V7/VI
Mode 6 of Blues
Over G7 · V7/II
Over C7 · V7/V
Mode 5 of Major
Over F7 · V7
Over Bbmaj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.