guitar scale
G♭ diminished (half–whole)
The same eight notes started a half step earlier: the scale that spells a dominant seventh with a flat ninth and a sharp ninth at once.
The same sounds spelled from the other side are F♯ diminished (half–whole).
Written out
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
What is true of it
G♭ diminished (half–whole) is G♭, A♭♭, B♭♭, B♭, C, D♭, E♭ and F♭, and back to G♭.
Its steps are H – W – H – W – H – W – H – W, where W is a whole step and H a half.
Written correctly it needs 9 alterations, A♭♭ and B♭♭ among them. That is what the letters force, and it is also why nobody writes music in this key: the same notes spelled from the other side are easier to read.
Across the first twelve frets of the guitar its notes fall in 52 places, which is what makes a scale a shape rather than a list.
Chords made only of these notes
Found by testing every chord in the catalogue against these 8 sounds, not chosen.
Other scales on G♭
C dim H-WC♯ dim H-WD♭ dim H-WD dim H-WD♯ dim H-WE♭ dim H-WE dim H-WF dim H-Wall 374