Originally Posted by: mikefsmso my question is, which way is correct? and if both are, then why are we learning them like that only if both names are possible?

[br]If you're discussing with other guitarists, refer to the C major scale by conventional alphabetical note nomenclature. Solmization relevant to the C major scale isn't [u]generally[/u] used in guitar IME & TMK.

The C major scale consists of 7 ascending notes starting from the root note, CDEFGAB(C) ending again on the root note C. That's how you should learn it.

Right now, the backstory on solmization is really just nice to know but superfluous information when you've other more relevant things to assimilate. If you follow the syllabus and maintain focus, you'll learn what you [u]need[/u] to know.

Technically though, your friend isn't incorrect re assignation of the syllables Do Re Mi etc to the C major scale. More about it here.