guitar scale
G♭ minor pentatonic
Major pentatonic started from its fifth note. The first scale most guitarists learn.
The same sounds spelled from the other side are F♯ minor pentatonic.
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♭ minor pentatonic is G♭, B♭♭, C♭, D♭ and F♭, and back to G♭.
Its steps are W+H – W – W – W+H – W, where W is a whole step and H a half.
Written correctly it needs 6 alterations, 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 34 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 5 sounds, not chosen.
Other scales on G♭
C min pentC♯ min pentD♭ min pentD min pentD♯ min pentE♭ min pentE min pentF min pentall 374