I'd come into filmmaking as a painter so, for me, making 'Good Will Hunting' was experimental because I didn't know how to do it.
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.
With 'Good Will Hunting,' Miramax made certain the recruited audience wasn't expecting to laugh at Robin Williams like they normally do. From my limited experience, you can really blow test screenings by conducting them in the wrong way.