I live in Baltimore, home of Philip Glass (as far as I know, he still lives in Baltimore) and a lot of my friends went to a famous Peabody conservatory. Even after graduation, a lot of them either entirely left music or struggling musicians, who have blue collar jobs.
I remember going to one the local bars and saw a girl working as bartender(she quite attractive), years before that, I saw her playing cello in one of the concerts.