When we're living as amateurs, we're running away from our calling - meaning our work, our destiny, the obligation to become our truest and highest selves.
In rare cases, I've had music before I shot the movie. I think that for 'Good Will Hunting' I had an Elliot Smith record or a couple of them and I just somehow felt like the sound had something to it that reminded me of the story. So in that case there was music beforehand.