Dolby Surround 7.1 is a sound system by Dolby Laboratories. It produces theatrical 7.1 surround sound in cinemas. It adds two new channels to current Dolby Digital 5.1. The first movie to feature Dolby Surround 7.1 was "Toy Story 3" (2010) by Disney and Pixar. There are 4,500 locations worldwide as of March 2013.