Yes - early music lessons in secondary school (mid-70s) embedded some of the real basics, and introduced some new music (also confirmed my dislike of a certain really famous band). Later on, O Level music gave me some good theory, and the ability to follow a score. This is now in that deep bank of knowledge that you don't know you have until something triggers it later, and has come in handy helping to shape songs, and bring ideas together in bands many years later.