Basic knowledge of staff and notation

The staff is indeed in C major, but it is marked with F under notation, that is, in G major, the staff do, Re, Mi, Fa, Sol, La, Si and Do; Symbol12345678; It can also be explained that English CDEFGAB, like the staff, has a notation of G major, which means that a major should have two phonemes based on C major, and the front two phonemes of C major should be removed, leaving only the back parts of SOL, LA, SI and DO, followed by a "full half" phoneme, and there is a whole tone connection between the two phonemes. Among them, FA needs to be raised by a semitone to make a "full semitone" sound pattern, so this major is: the tonic in this major is SOL, so the key name is G major, and key signature is #FA. That is, take sol(5) as do( 1) and la(6) as re (2); And so on. You can try it on the piano.