At fourteen years old, best friends Lips and Robb Reiner made a pact to rock together forever. Their band Anvil, hailed as the “demi-gods of Canadian metal,” influenced a musical generation including Met-allica, Slayer and Anthrax. Though Anvil never made it, they never stopped playing or believing. Following a calamitous European tour, Lips and Robb, now well into their fifties, set off to record their thirteenth album, “This is Thirteen,” in one last attempt to fulfill their boyhood dream.