Chord sequence
F♯maj7 Gdim7 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
All the chords
The I-VI-ii-V with a diminished 7th chord on #I in place of VI7, so the bass rises by half steps from I to ii.
Over F#maj7 · Imaj7
The major scale and its modes are the most commonly used scales in western music.
Over Gdim7 · ♭ii°7
Mode 7 of Harmonic Minor
Over G#m7 · ii7
Mode 2 of Major
Over C#7 · V7
Mode 5 of Major