Disney-Pixar’s “Monsters University” rocks theaters this summer featuring music from award-winning composer Randy Newman and Axwell & Sebastian Ingrosso of Swedish House Mafia. Filmmakers also tapped the Atlanta-based hard rock band Mastodon to serenade one of the film’s new monsters. Directed by Dan Scanlon and produced by Kori Rae , “Monsters University” hits theaters June 21, 2013, with the short film “The Blue Umbrella,” which features music by composer Jon Brion and vocals by Sarah Jaffe . “We wanted to…