G harmonic minor

G1A2B♭♭3C4D5E♭♭6F♯7

Natural minor with the seventh raised, which buys a leading note and pays for it with a step and a half between the sixth and seventh.

Written out

Fig. 2 · G harmonic minor, ascending

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

GWAHB♭WCWDHE♭W+HF♯HG

G harmonic minor is G, A, B♭, C, D, E♭ and F♯, and back to G.

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

On the same tonic, G natural minor differs from it by exactly one note.

Across the first twelve frets of the ukulele its notes fall in 31 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.