D.I. is an American punk rock band formed in 1981 in Fullerton, California. It was founded by vocalist and primary songwriter Casey Royer, after previously playing drums in the bands Adolescents and Social Distortion. Since its formation, D.I. has had many line-up changes over the years with Royer being the only constant member of the band. The band has continued to work, although they have had inactive periods, which include the band going on hiatus between albums. During their years of touring and recording albums, D.I. have never gained a huge mainstream success, but they have influenced many of the 1990s era melodic hardcore punk and punk rock revival bands, including Face to Face, Guttermouth, Jughead's Revenge, The Offspring, and Pennywise. Members of the band also joined up with Daddy X and the Dirtball of the Kottonmouth Kings, to create the punk rock band the X-Pistols, in 2010. History Early history (1981–1986) D.I. was formed in 1981 after the Adolescents' first break-up. The band's name initially stood for "Drug Ideology", but now, the initials no longer have any meaning. Their original line-up consisted of Casey Royer on vocals, Tim Maag on guitar, Fredric Taccone on bass guitar, and Derek O'Brien on drums. The band combined the Orange County hardcore punk sound with a decidedly surf and new wave style on their debut self-titled EP. The EP featured five songs, including "Richard Hung Himself" (originally written by Casey Royer while he played for the Adolescents, recorded with the Adolescents and later re-recorded with D.I.), "Venus De Milo", "Reagan der Führer", "Purgatory", and "Guns". This EP was later reissued as Team Goon with extra tracks including versions of Gary Glitter's "Rock and Roll Part II", The Saint and Nuclear Funeral. The album was later released as a CD which added a cover of DEVO's Uncontrollable Urge which itself was originally released by XXX Records as the B-side on the 7-inch e.p. along with Surfing Anarchy The band's first studio album Ancient Artifacts was a more straight ahead Orange County-sounding album that included a new version of "Purgatory" from the EP. Not long after the release of Ancient Artifacts, D.I. returned to the studio to record their second album Horse Bites Dog Cries, which was not released until 1986 (although the album itself has copyright date of 1985). This is generally considered their best studio album. Two more albums and hiatus (1987–1992) Before