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.
Gus Van SantI try to shoot the first rehearsal because people are more spontaneous. People in real life don't really know where they are going to be either positioning themselves or how they will be saying their words. When people goof during the first take, it usually looks realistic.
Gus Van Sant