piano scale
A double harmonic
A1B♭♭2C♯3D4E5F♭6G♯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
AHB♭W+HC♯HDWEHFW+HG♯HA
What is true of it
A double harmonic is A, B♭, C♯, D, E, F and G♯, and back to A.
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, A 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 A
A Phrygian dominantexoticA Lydian dominantexoticA alteredexoticA majormajorA natural minorminorA harmonic minorminor
C dbl harmC♯ dbl harmD♭ dbl harmD dbl harmD♯ dbl harmE♭ dbl harmE dbl harmF dbl harmall 374