NPR have the full soundtrack up to stream if anyone is interested - previous soundtracks by Trent and Atticus have been great so I've already preordered.

First Listen: Trent Reznor & Atticus Ross, 'Gone Girl (Motion Picture Soundtrack)' : NPR (http://www.npr.org/2014/09/25/350948108/first-listen-trent-reznor-atticus-ross-gone-girl-motion-picture-soundtrack)