G♭ Lydian dominant

G♭1A♭2B♭3C♯4D♭5E♭6F♭♭7

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

The same sounds spelled from the other side are F♯ Lydian dominant.

Written out

Fig. 2 · Gb 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.

G♭WA♭WB♭WCHD♭WE♭HF♭WG♭

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

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, G♭ Lydian differs from it by exactly one note.

Across the first twelve frets of the ukulele its notes fall in 30 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.