Metallica decided to team up with producer Bob Rock after hearing his work on Mötley Crüe's Dr. Feelgood. While they had no interest in writing songs like "Slice of Your Pie," they liked the polished sound of Rock's work. Metallica's previous album, . . . And Justice for All, got them on MTV and into basketball arenas, but they had yet to cross over into the mainstream. Few in the industry (or even the band) could have imagined just how popular Metallica would become. "Enter Sandman" went into heavy rotation on MTV, and suddenly it was no longer just the metal kids at school blasting Metallica in the parking lot. The group was as big as Guns N' Roses and U2, suddenly playing to stadiums and even attracting large numbers of women to their shows. The record company was overjoyed, but some original fans felt betrayed. Looking back now, the album doesn't seem like an insane departure from their previous work. Metallica remain one of the biggest bands in the world, but there's still a very vocal minority of fans who feel that Metallica was the beginning of the end.