D-flat major
Scale
D-flat major is a major scale based on D♭, consisting of the pitches D♭, E♭, F, G♭, A♭, B♭ and C. Its key signature has five flats.
The D-flat major scale is:
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Its... Wikipedia
Equivalent: C-sharp major
Parallel key: D-flat minor (theoretical); →enharmonic: C-sharp minor
Relative key: B-flat minor