B Lydian dominant

B1C♯2D♯3E♯♯4F♯5G♯6A♭7

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

Written out

Fig. 2 · B 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.

BWC♯WD♯WE♯HF♯WG♯HAWB

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

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

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

Across the first twelve frets of the ukulele its notes fall in 29 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.