I saw this independent horror film about 6-8 years ago. A town had been rapidly evacuated and the film follows a confused group that are wandering about trying to find out what happened to everyone. There is music constantly playing from the sky and its slowly driving the group crazy. At some point one of the members snaps and tears another of the members arm off and runs off into the woods as two others watch from afar with binoculars. The remaining group eventually finds their way to a random theatre with some kind of unnerving film playing as a stranger stands in the back of the theatre watching along. The movie ends there basically .