F♯ (musical note)
F♯ (F-sharp; also known as fa dièse or fi) is the seventh semitone of the solfège.
It lies a chromatic semitone above F and a diatonic semitone below G, thus being enharmonic to sol bémol or G♭ (G-flat). However, in some temperaments, it is not the same as G♭. G♭ is a major third below B♭, whereas F♯ is a major third above D (a minor third below A).
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the F♯ above middle C (or F♯4) is approximately 369.994 Hz. See pitch (music) for a discussion of historical variations in frequency.
Designation by octave
| Scientific designation | Helmholtz designation | Octave name | Frequency (Hz) |
|---|---|---|---|
| F♯−1 | F♯͵͵͵ or ͵͵͵F♯ or FFFF♯ | Subsubcontra | 11.562 |
| F♯0 | F♯͵͵ or ͵͵F♯ or FFF♯ | Subcontra | 23.125 |
| F♯1 | F♯͵ or ͵F♯ or FF♯ | Contra | 46.249 |
| F♯2 | F♯ | Great | 92.499 |
| F♯3 | f♯ | Small | 184.997 |
| F♯4 | f♯′ | One-lined | 369.994 |
| F♯5 | f♯′′ | Two-lined | 739.989 |
| F♯6 | f♯′′′ | Three-lined | 1479.978 |
| F♯7 | f♯′′′′ | Four-lined | 2959.955 |
| F♯8 | f♯′′′′′ | Five-lined | 5919.911 |
| F♯9 | f♯′′′′′′ | Six-lined | 11839.822 |
| F♯10 | f♯′′′′′′′ | Seven-lined | 23679.643 |
Scales
Common scales beginning on F♯
- F♯ Major: F♯ G♯ A♯ B C♯ D♯ E♯ F♯
- F♯ Natural Minor: F♯ G♯ A B C♯ D E F♯
- F♯ Harmonic Minor: F♯ G♯ A B C♯ D E♯ F♯
- F♯ Melodic Minor Ascending: F♯ G♯ A B C♯ D♯ E♯ F♯
- F♯ Melodic Minor Descending: F♯ E D C♯ B A G♯ F♯
Jazz melodic minor
- F♯ Ascending Melodic Minor: F♯ G♯ A B C♯ D♯ E♯ F♯
- F♯ Dorian ♭2: F♯ G A B C♯ D♯ E F♯
- F♯ Lydian Augmented: F♯ G♯ A♯ B♯ C
- F♯ Lydian Dominant: F♯ G♯ A♯ B♯ C♯ D♯ E F♯
- F♯ Mixolydian ♭6: F♯ G♯ A♯ B C♯ D E F♯
- F♯ Locrian ♮2: F♯ G♯ A B C D E F♯
- F♯ Altered: F♯ G A B♭ C D E F♯
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