Korn's cathartic sound positioned the group as one of the most popular and provocative acts to emerge during the 1990s. At the forefront of the nu-metal/rap-rock movement of the time, they quickly evolved, developing a trademark style that incorporated downtuned guitars, a groove-heavy rhythm section, haunted atmospheric production, and dark lyrics courtesy of frontman Jonathan Davis, who grappled with common themes such as childhood trauma, destructive behavior, and inner demons. (They even managed to make scatting and bagpipes -- Davis' signature instrument -- menacing.) The...