A musician is someone who makes music, that's the end of it. It's got nothing to do with whether you do it for money; some of the most mechanical players I have ever heard do it for money, some of the most musical people I have ever met don't.

It's got nothing to do with having attained the level of musicianship; no matter how "good" you are a) you can improve and b) someone out there is better.

It certainly has nothing to do with learning how to read and write one particular cultural form and I am astounded that in a folk world where music has been passed on orally by illiterate musicians anyone would suggest that it does. (O'Carolan could not read music)

Once you are a musician you can become all kinds of things; Performer, entertainer, educator, technician but never lose the ability just to make music, just for the hell of it.
love Robbie