With their 1978 eponymous debut, Van Halen simultaneously rewrote the rules of rock guitar and hard rock in general. Guitarist Eddie Van Halen redefined what electric guitar could do, developing a blindingly fast technique with a variety of self-taught two-handed tapping, hammer-ons, pull-offs, and effects that mimicked the sounds of machines and animals. It was wildly inventive and over the top,  Eddie and front man Roth made Van Halen into the most popular American rock & roll band of the late '70s and early '80s, and in the process set the template for hard rock and heavy metal for the '80s. Throughout the '80s, it was impossible not to hear Van Halen's instrumental technique on records that ranged from the heaviest metal to soft pop. Furthermore, Roth's irony-drenched antics were copied by singers who took everything literally. One of these was Sammy Hagar, an arena rock veteran from the '70s who replaced Roth after the vocalist had a falling out with Van Halen in 1985. Hagar stayed with the band longer than Roth, helping the group top the charts through the late '80s and early '90s. However, the group's sales began to slide in the mid-'90s, just as tensions between Hagar and Eddie began to arise. In one of the most disastrous publicity stunts in rock history, Hagar was fired (or quit) and Roth was brought back on, seemingly as a permanent member, but only for two songs on a greatest-hits album. He was subsequently replaced by Gary Cherone, a former member of Extreme