piano scale
G double harmonic
G1A♭♭2B3C4D5E♭♭6F♯7
Two augmented seconds in one scale, one above the tonic and one below the octave.
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
GHA♭W+HBHCWDHE♭W+HF♯HG
What is true of it
G double harmonic is G, A♭, B, C, D, E♭ and F♯, and back to G.
Its steps are H – W+H – H – W – H – W+H – H, where W is a whole step and H a half.
On the same tonic, G harmonic major differs from it by exactly one note.
Chords made only of these notes
Found by testing every chord in the catalogue against these 7 sounds, not chosen.
Other scales on G
G Phrygian dominantexoticG Lydian dominantexoticG alteredexoticG majormajorG natural minorminorG harmonic minorminor
C dbl harmC♯ dbl harmD♭ dbl harmD dbl harmD♯ dbl harmE♭ dbl harmE dbl harmF dbl harmall 374