The spare, rocky, rustically beautiful vistas which Walter passes through bring a sense of grandeur to the otherwise personal, low-key premise, and it doesn't hurt when the sights are accompanied by a richly composed score from Theodore Shapiro (2012's " Hope Springs ") and towering soundtrack cuts that include "Lake Michigan" by Rogue Wave, "Dirty Paws" by Of Monsters and Men, and "Wake Up" by Arcade Fire.