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 F
(a diatonic semitone below G♯) and A
(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 |
G͵ |
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 |
See also [edit]
(a diatonic semitone below G♯) and A
(a diatonic semitone above G♭).
