G♯ (musical note)

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.

In the medieval period the musical note G# was known as gesolreut within the Guidonian hand hexachord system.^[3]

[1]

[2]

[3]

Scientific designation	Helmholtz designation	Octave name	Frequency (Hz)	MIDI note number
G♯₋₁	G♯͵͵͵ or ͵͵͵G♯ or GGGG♯	Subsubcontra	12.978	8
G♯₀	G♯͵͵ or ͵͵G♯ or GGG♯	Subcontra	25.957	20
G♯₁	G♯͵ or ͵G♯ or GG♯	Contra	51.913	32
G♯₂	G♯	Great	103.826	44
G♯₃	g♯	Small	207.652	56
G♯₄	g♯′	One-lined	415.305	68
G♯₅	g♯′′	Two-lined	830.609	80
G♯₆	g♯′′′	Three-lined	1661.219	92
G♯₇	g♯′′′′	Four-lined	3322.438	104
G♯₈	g♯′′′′′	Five-lined	6644.875	116
G♯₉	g♯′′′′′′	Six-lined	13289.75	N/A
G♯₁₀	g♯′′′′′′′	Seven-lined	26579.501	N/A

G♯ (musical note)

Designation by octave

Scales

Common scales beginning on G♯

Diatonic scales

Jazz melodic minor

See also

References

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