piano scale
D♭ harmonic minor
Natural minor with the seventh raised, which buys a leading note and pays for it with a step and a half between the sixth and seventh.
The same sounds spelled from the other side are C♯ harmonic 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
D♭ harmonic minor is D♭, E♭, F♭, G♭, A♭, B♭♭ and C, and back to D♭.
Its steps are W – H – W – W – H – W+H – H, where W is a whole step and H a half.
Written correctly it needs 7 alterations, B♭♭ 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♭ natural 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 D♭
C harm minD harm minD♯ harm minE♭ harm minE harm minF harm minF♯ harm minG♭ harm minall 374