Dolby Surround 7.1 is a sound system by Dolby Laboratories which delivers theatrical 7.1 surround sound to movie-goers. It adds two new channels to current Dolby Digital 5.1. The first movie to feature Dolby Surround 7.1 was 2010's Toy Story 3 by Disney and Pixar. There are 4,500 locations worldwide as of March 2013.