Often composers fall into a groove, defining themselves with a particular style and running with it across the cinematic board. Not so with Nathan Barr, whose career is speckled with comedies, horror movies and a little of everything in-between. Barr’s eclectic resume includes True Blood; Eli Roth’s Cabin Fever; Broken Lizard’s Club Dread, Beerfest and The Slammin’ Salmon; The Last Exorcism; and Ruben Fleischer’s upcoming action comedy 30 Minutes or Less. His latest, the character-driven thriller The Ledge, was picked up by IFC Films after premiering at Sundance. The movie centers on Gavin (Charlie Hunnam) who has an affair with Shana (Liv Tyler), the wife of fanatical religious man Joe (Patrick Wilson) who forces Gavin to either jump off the ledge of a building or watch him kill his wife. It’s like that middle school game “MFK,” but real. We sat down with Barr during Sundance to talk about his process as a composer, the similarities and differences between his many projects and what how each one is its own musical challenge: