1. Insanity (U.S.A) Formed in 1985, Bay Area band Insanity were instrumental in metal's evolution from thrash to death metal. Drummer Bud Mills was a big reason why, as his so-called "1-1" beat presaged the modern blastbeat. The band's sound more than lived up to its name. Not only did it crank thrash up to frenzied warp speeds, it also displayed chops well ahead of its time. Insanity were legendary worldwide in the '80s metal tape trading circuit, with members of Carcass and Napalm Death citing them as an influence. Read more about Insanity on Last.fm.