F♯ (musical note)

${ \new Staff \with{ \magnifyStaff #3/2 } << \time 2/1 \override Score.TimeSignature #'stencil = ##f { \clef bass fis1_F-sharp \clef treble fis' } >> }$

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) in 12 equal temperament. However, in other temperaments, such as quarter-comma meantone, 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). Another enharmonic note is E (E-double sharp).

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 369.994Hz.^[1] 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♯

Diatonic scales

F♯ Ionian: F♯ G♯ A♯ B C♯ D♯ E♯ F♯
F♯ Dorian: F♯ G♯ A B C♯ D♯ E F♯
F♯ Phrygian: F♯ G A B C♯ D E F♯
F♯ Lydian: F♯ G♯ A♯ B♯ C♯ D♯ E♯ F♯
F♯ Mixolydian: F♯ G♯ A♯ B C♯ D♯ E F♯
F♯ Aeolian: F♯ G♯ A B C♯ D E F♯
F♯ Locrian: F♯ G A B C D E 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 D♯ E♯ F♯
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♯

References

^ Suits, B. H. (1998). "Physics of Music Notes - Scales: Just vs Equal Temperament". MTU.edu. Michigan Technological University. Archived from the original on 27 November 2023. Retrieved 5 February 2024.