| Relative key | A♯ minor |
|---|---|
| Parallel key | C♯ minor |
| Dominant key |
G♯ major enharmonic: A♭ major |
| Subdominant | F♯ major |
| Enharmonic | D♭ major |
| Component pitches | |
| C♯, D♯, E♯, F♯, G♯, A♯, B♯ | |
C♯ major (or 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♯ minor (or enharmonically B♭ minor) and its parallel minor is C♯ minor.
The direct enharmonic equivalent of C♯ major is D♭ major.