C-sharp major

{{Short description|Musical scale and key signature}}

{{No footnotes|date=April 2024}}

{{Infobox musical scale

| name=C-sharp major{ \magnifyStaff #3/2 \omit Score.TimeSignature \key cis \major s16 \clef F \key cis \major s^"" }

| relative=A-sharp minor

| parallel=C-sharp minor

| dominant=G-sharp major (theoretical)
→enharmonic : A-flat major

| subdominant=F-sharp major

| enharmonic=D-flat major

| first_pitch=C{{music|sharp}}

| second_pitch=D{{music|sharp}}

| third_pitch=E{{music|sharp}}

| fourth_pitch=F{{music|sharp}}

| fifth_pitch=G{{music|sharp}}

| sixth_pitch=A{{music|sharp}}

| seventh_pitch=B{{music|sharp}}

}}

C-sharp major is a major scale based on C♯ (musical note), consisting of the pitches C{{music|sharp}}, D♯ (musical note), E♯ (musical note), F♯ (musical note), G♯ (musical note), A♯ (musical note), and C (musical note). 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:

{{block indent|

\header { tagline = ##f }

scale = \relative b { \key cis \major \omit Score.TimeSignature

cis^"C♯ natural major scale" dis eis fis gis ais bis cis bis ais gis fis eis dis cis2 \clef F \key cis \major }

\score { { << \cadenzaOn \scale \context NoteNames \scale >> } \layout { } \midi { } }

}}

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:

{{block indent|

\header { tagline = ##f }

scale = \relative b { \key cis \major \omit Score.TimeSignature

cis^"C♯ harmonic major scale" dis eis fis gis a bis cis bis a gis fis eis dis cis2 \clef F \key cis \major }

\score { { << \cadenzaOn \scale \context NoteNames \scale >> } \layout { } \midi { } }

}}

{{block indent|

\header { tagline = ##f }

scale = \relative b { \key cis \major \omit Score.TimeSignature

cis^"C♯ melodic major scale (ascending and descending)" dis eis fis gis ais bis cis b a gis fis eis dis cis2 \clef F \key cis \major }

\score { { << \cadenzaOn \scale \context NoteNames \scale >> } \layout { } \midi { } }

}}

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.