There is something about the live performance of an orchestra that makes it very different to a film. With a film, you can rewrite it in a way with the material you have, and in rehearsals, you're really trying out different things. In an orchestra, you can't do that. They separate as soon as the performance factor comes into play.
In Mexico, audiences want to see a big discussion around a film - what we expect from Hollywood films worldwide is more of an entertaining show. 'Y Tu Mama Tambien' was a road movie and comedy, but it had a very strong political connotation that sparked a discussion in Mexico that is still going on.