G (musical note)

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Sol, So, or G is the fifth note of the fixed-Do solfège starting on C. As such it is the dominant, a perfect fifth above C or perfect fourth below C.

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of Middle G (G4) note is approximately 391.995 Hz. See pitch for a discussion of historical variations in frequency.

It has enharmonic equivalents of Fdouble sharp (a diatonic semitone below G) and Adouble flat (a diatonic semitone above G).

Designation by octave[edit]

Scientific designation Helmholtz designation Octave name Frequency (Hz)
G-1 G͵͵͵ Subsubcontra 12.25
G0 G͵͵ Subcontra 24.5
G1 Contra 48.999
G2 G Great 97.999
G3 g Small 195.998
G4 g′ One-lined 391.995
G5 g′′ Two-lined 783.991
G6 g′′′ Three-lined 1567.982
G7 g′′′′ Four-lined 3135.963
G8 g′′′′′ Five-lined 6271.927
G9 g′′′′′′ Six-lined 12543.854
G10 g′′′′′′ Seven-lined 25087.708

See also[edit]