G♯ (musical note)

${ \new Staff \with{ \magnifyStaff #3/2 } << \time 2/1 \override Score.TimeSignature #'stencil = ##f { \clef bass gis1_G-sharp \clef treble gis' } >> }$

G♯ (G-sharp) or sol dièse is the ninth semitone of the solfège. In the German pitch nomenclature, it is known as gis.^[1]

It lies a chromatic semitone above G and a diatonic semitone below A, thus being enharmonic to la bémol or A♭ (A-flat).^{[citation needed]}

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the G♯ semitone is approximately 415.305 Hz.^[2] See pitch (music) for a discussion of historical variations in frequency.

The notes A♭ and G♯ are the only notes to have only one enharmonic, since they cannot be reached in any other way by a single or double sharp or a single or double flat from any of the seven white notes.

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Designation by octave

Scientific designation	Helmholtz designation	Octave name	Frequency (Hz)
G♯₋₁	G♯͵͵͵ or ͵͵͵G♯ or GGGG♯	Subsubcontra	12.978
G♯₀	G♯͵͵ or ͵͵G♯ or GGG♯	Subcontra	25.957
G♯₁	G♯͵ or ͵G♯ or GG♯	Contra	51.913
G♯₂	G♯	Great	103.826
G♯₃	g♯	Small	207.652
G♯₄	g♯′	One-lined	415.305
G♯₅	g♯′′	Two-lined	830.609
G♯₆	g♯′′′	Three-lined	1661.219
G♯₇	g♯′′′′	Four-lined	3322.438
G♯₈	g♯′′′′′	Five-lined	6644.875
G♯₉	g♯′′′′′′	Six-lined	13289.75
G♯₁₀	g♯′′′′′′′	Seven-lined	26579.501