C♯ (musical note)
C♯ (C-sharp) is a musical note lying a chromatic semitone above C and a diatonic semitone below D. C-sharp is thus enharmonic to D♭. It is the second semitone in the French solfège and is known there as do dièse.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of C♯4 (the C♯ above middle C) is about 277.18 Hz. See pitch (music) for a discussion of historical variations in frequency.
Designation by octave
| Scientific designation | Helmholtz designation | Bilinear music notation | Octave name | Frequency (Hz) |
|---|---|---|---|---|
| C♯-1 | C♯͵͵͵ or ͵͵͵C♯ or CCCC♯ | (-uC♯) | Subsubcontra | 8.662 |
| C♯0 | C♯͵͵ or ͵͵C♯ or CCC♯ | (-vC♯) | Subcontra | 17.324 |
| C♯1 | C♯͵ or ͵C♯ or CC♯ | (-wC♯) | Contra | 34.648 |
| C♯2 | C♯ | (-xC♯) | Great | 69.296 |
| C♯3 | c♯ | (-yC♯) | Small | 138.591 |
| C♯4 | c♯′ | (zC♯) | One-lined | 277.183 |
| C♯5 | c♯′′ | (yC♯) | Two-lined | 554.365 |
| C♯6 | c♯′′′ | (xC♯) | Three-lined | 1108.731 |
| C♯7 | c♯′′′′ | (wC♯) | Four-lined | 2217.461 |
| C♯8 | c♯′′′′′ | (vC♯) | Five-lined | 4434.922 |
| C♯9 | c♯′′′′′′ | (uC♯) | Six-lined | 8869.844 |
| C♯10 | c♯′′′′′′′ | (tC♯) | Seven-lined | 17739.688 |
Common scales beginning on C♯
- C♯ Major: C♯ D♯ E♯ F♯ G♯ A♯ B♯ C♯
- C♯ Natural Minor: C♯ D♯ E F♯ G♯ A B C♯
- C♯ Harmonic Minor: C♯ D♯ E F♯ G♯ A B♯ C♯
- C♯ Melodic Minor Ascending: C♯ D♯ E F♯ G♯ A♯ B♯ C♯
- C♯ Melodic Minor Descending: C♯ B A G♯ F♯ E D♯ C♯
- C♯ Dorian: C♯ D♯ E F♯ G♯ A♯ B C♯
See also
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