Chord sequence
Gm7 B♯7 G♯m7 C♯7
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 F# major
Chords 1 to 2
Gm7 B#7
Chords 3 to 4
G#m7 C#7
Over Gm7 · ♭ii7
Mode 6 of Blues
Over B#7 · V7/vii
Over G#m7 · ii7
Mode 2 of Major
Over C#7 · V7
Mode 5 of Major