<p>"Composition/film studies would be a dream option for him." Then USC is the place to be. The cinematic arts school is pretty difficult to be accepted into for those who apply as CA majors, but he should be able to do a minor in CA. USC has a very fine orchestra, and there is less of a "barrier" between students in the the Music program and other students than seems to exist at other colleges.
Did your S take the PSAT? if so, did he qualify for NMS?</p>