Think all the glamour is in Hollywood? This week on American Routes we’re going to the movies. John Sayles, writer-director of such classic films as “Lonestar” and “Matewan,” talks about how he uses music to evoke emotion. French Canadian director Andre Gladu shares his documentary vision and stories of following music along the Mississippi and French Louisiana. Plus composer Thomas Newman takes us behind the scenes of Altman’s “The Player,” Disney’s “Wall-E” and more.