F♯ Lydian dominant

F♯1G♯2A♯3B♯♯4C♯5D♯6E♭7

Raised fourth and flattened seventh at once — the fourth mode of melodic minor.

The same sounds spelled from the other side are G♭ Lydian dominant.

Written out

Fig. 2 · F# Lydian dominant, ascending

Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.

F♯WG♯WA♯WB♯HC♯WD♯HEWF♯

F♯ Lydian dominant is F♯, G♯, A♯, B♯, C♯, D♯ and E, and back to F♯.

Its steps are W – W – W – H – W – H – W, where W is a whole step and H a half.

It costs 6 alterations to write — near the limit of what a key signature can carry.

On the same tonic, F♯ Lydian differs from it by exactly one note.

Across the first twelve frets of the guitar its notes fall in 44 places, which is what makes a scale a shape rather than a list.

Found by testing every chord in the catalogue against these 7 sounds, not chosen.