Chord sequence
G♭m7 B7 Cdim7 D♭m7
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 Db minor
Chords 1 to 2
Gbm7 B7
Over Gbm7 · iv7
Mode 2 of Major
Over B7 · ♭VII7
Mode 5 of Major
Over Cdim7 · vii°7
Mode 7 of Harmonic Minor
Over Dbm7 · i7