Ok - by that definition I am a true musician vocally (though still a work in progress).
I study classical singing, sing & play folk & blues at pub sessions, know only a smattering of notation theory, and work 4/5 week at a fairly good job in order to have the 5th day to hone my tools (vocal).
Music is not where I earn my money - but its where my heart soul passion & focus is.

Kris