Key
Chords in F# Lydian
F# Lydian is built from the notes F#, G#, A#, B#, C#, D# and E#. Its scale carries 7 sharps. Harmonising that scale in thirds gives seven chords — 3 majors, 3 minors and 1 diminished — starting on F# as the I. The chord on the fifth degree is C#, a major V, so F# Lydian has the leading tone that makes a C#-to-F# cadence sound final.
Beyond those seven, F# Lydian commonly borrows F#m (i), G#dim (iiø), A (bIII), Bm (iv) and C#m (v) from the parallel minor — the mixture chords that give a progression somewhere unexpected to go.
The seven chords
Extended to four notes each, the same seven degrees give F#maj7, G#7, A#m7, B#m7b5, C#maj7, D#m7, E#m7.
Borrowed chords
Capo 6 and play B# Lydian shapes to sound F# Lydian.
All eight capo positions for F# Lydian →