Sonic Sum is an American hip hop group from New York. It consists of Rob Sonic, Fred Ones, Eric M.O., and Preservation. The group was described by CMJ New Music Monthly as "hip-hop's Radiohead".In 2000, Sonic Sum released the first album, The Sanity Annex, on Ozone Music. It has received critical acclaim worldwide. In 2004, the group released the second album, Films, exclusively in Japan. It was re-released on Definitive Jux in 2008, then on vinyl by a night on canopy records in 2015