C-sharp major is a major scale based on C♯, consisting of the pitches C♯, D♯, E♯, F♯, G♯, A♯, and B♯. Its key signature has seven sharps. Its relative minor is A-sharp minor (or enharmonically B-flat minor), its parallel minor is C-sharp minor, and its enharmonic equivalence is D-flat major.
The C-sharp major scale is:
Changes needed for the melodic and harmonic versions of the scale are written in with accidentals as necessary. The C-sharp harmonic major and melodic major scales are:
A harp tuned to C-sharp major has all its pedals in the bottom position. Because all the strings are then pinched and shortened, this is the least resonant key for the instrument.