I disagree. It seems to me that people who have music creation as a terminal goal are more likely to create good music than people who have music creation as an instrumental goal. Humans are not perfect rationalists, and human motivation is a fickle beast. If you want to be a music star, and you have control over your terminal goals, I strongly suggest adopting a terminal goal of creating good music.
I suggest that you abandon the word 'terminal' and simply speak of goals. You are using the word incorrectly and so undermining whatever other point you may have had.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.