The score for the Josh Brolin and Megan Fox starring movie was composed by Mastodon and film composer Marco Beltrami. Mastodon bassist Troy Sanders told Paste magazine: "[Director Jimmy Hayward] played scenes for us and gave us all day long to create music that matched the emotion of the scene. It was flattering to be given 100% creative control in this movie. It was very pure, it was real creative and totally spur of the moment. We wrote variations on themes for each character, different variables for a bunch of riffs: faster, slower, heavier, lighter. It's the Darth Vader approach. Some of it was heavy, some of it was very moody. A lot of it was spacey, Melvins B-sides, Pink Floyd-like, surreal outer space, like Neil Young's Dead Man. Swirling, nausea music."