piano scale
A♯ Hungarian minor
Harmonic minor with a raised fourth, which puts a second augmented second in the middle of the scale.
The same sounds spelled from the other side are B♭ Hungarian minor.
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
A♯ Hungarian minor is A♯, B♯, C♯, D𝄪, E♯, F♯ and G𝄪, and back to A♯.
Its steps are W – H – W+H – H – H – W+H – H, where W is a whole step and H a half.
Written correctly it needs 9 alterations, D𝄪 and G𝄪 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.
On the same tonic, A♯ harmonic minor 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♯
C hung minC♯ hung minD♭ hung minD hung minD♯ hung minE♭ hung minE hung minF hung minall 374