piano scale
F♯ double harmonic
F♯1G♭2A♯3B4C♯5D♭6E♯7
Two augmented seconds in one scale, one above the tonic and one below the octave.
The same sounds spelled from the other side are G♭ double harmonic.
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
F♯HGW+HA♯HBWC♯HDW+HE♯HF♯
What is true of it
F♯ double harmonic is F♯, G, A♯, B, C♯, D and E♯, and back to F♯.
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, F♯ 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 F♯
F♯ Phrygian dominantexoticF♯ Lydian dominantexoticF♯ alteredexoticF♯ majormajorF♯ natural minorminorF♯ harmonic minorminor
C dbl harmC♯ dbl harmD♭ dbl harmD dbl harmD♯ dbl harmE♭ dbl harmE dbl harmF dbl harmall 374