Quora (of all places) has some really good articles about this. Check for example the second answer in this page: https://www.quora.com/Why-are-there-only-12-p

Quora (of all places) has some really good articles about this. Check for example the second answer in this page: https://www.quora.com/Why-are-there-only-12-pitch-notes-C-C-B-in-the-world https://www.quora.com/Why-are-there-only-12-pitch-notes-C-C-...