piano scale
D♯ harmonic major
Major with a flattened sixth: the mirror of harmonic minor, and the reason a major key can borrow a minor subdominant.
The same sounds spelled from the other side are E♭ harmonic major.
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
D♯ harmonic major is D♯, E♯, F𝄪, G♯, A♯, B and C𝄪, and back to D♯.
Its steps are W – W – H – W – H – W+H – H, where W is a whole step and H a half.
Written correctly it needs 8 alterations, F𝄪 and C𝄪 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, D♯ 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 D♯
C harm majC♯ harm majD♭ harm majD harm majE harm majF harm majF♯ harm majG♭ harm majall 374