Sol, So, or G is the fifth note of the solfège starting on C. As such it is the dominant, a perfect fifth above 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.
Its enharmonics are F and A.
| 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 | 3135.964 |
| G8 | g′′′′′ | Five-lined | 6271.927 |
| G9 | g′′′′′′ | Six-lined | 12543.854 |
|
|||||