Im not a music wiz, so i just googled your question and found that, 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
This doesn't make any sense to me so if this answer doesn't help please delete it. Thank you!