G♭ Lydian

G♭1A♭2B♭3C♯4D♭5E♭6F7

Major with a raised fourth. The fourth mode of the major scale.

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

Written out

Fig. 2 · Gb Lydian, 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♭WFHG♭

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

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

On the same tonic, G♭ major 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.