guitar scale
G♭ diminished (whole–half)
Eight notes alternating whole step and half step. Symmetrical, so it repeats every minor third.
The same sounds spelled from the other side are F♯ diminished (whole–half).
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 (whole–half) is G♭, A♭, B♭♭, C♭, D♭♭, E♭♭, E♭ and F, and back to G♭.
Its steps are W – H – W – H – W – H – W – H, where W is a whole step and H a half.
Written correctly it needs 10 alterations, B♭♭, D♭♭ and E♭♭ 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 51 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 W-HC♯ dim W-HD♭ dim W-HD dim W-HD♯ dim W-HE♭ dim W-HE dim W-HF dim W-Hall 374