One of my favorite pieces of movie music is from a movie I've yet to see. The Reivers, a 1960s movie based on the novel by William Faulkner, was scored by John Williams. The music was later arranged into a lovely suite with narration by the late Burgess Meredith.
Much of the narration is loosely based on Faulkner's narrative although it does not quote it directly. One of my favorite lines is,
Boone knew something that I did not: That the rewards of virtue are cold and odorless and tasteless and not to be compared to the bright and exciting pleasures of sin and wrongdoing.