A German heavy metal outfit founded and fronted by powerhouse vocalist , U.D.O. emerged in the late '80s after exited the popular power metal group . Beginning with 1987's Animal House, and a rotating cast of players carved out a huge swath of heavy metal real estate, averaging a full-length LP every year or so (2021's Game Over was the group's 17th full-length effort) and touring on the strength of an impressive catalog of European power metal that also included classics like "Balls to the Wall" and "Fast as a Shark."