C-sharp major

C-sharp major
${ \magnifyStaff #3/2 \omit Score.TimeSignature \key cis \major s16 \clef F \key cis \major s^"" }$
Relative key	A-sharp minor
Parallel key	C-sharp minor
Dominant key	G-sharp major (theoretical); →enharmonic : A-flat major
Subdominant	F-sharp major
Enharmonic	D-flat major
Component pitches
	C♯, D♯, E♯, F♯, G♯, A♯, B♯

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:

${ \omit Score.TimeSignature \relative c' { \key cis \major \time 7/4 cis dis eis fis gis ais bis cis bis ais gis fis eis dis cis2 \clef F \key cis \major } }$

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.