Public Enemy rewrote the rules of hip-hop, becoming the most influential and controversial rap group last century and, for many, the definitive rap group of all time. Selling millions of records along the way, and building from Run-D.M.C.'s street-oriented beats and Boogie Down Productions' proto-gangsta rhyming, Public Enemy pioneered a variation of hardcore rap that was musically and politically revolutionary.

With his powerful, authoritative baritone, lead rapper Chuck D rhymed about all kinds of social problems, particularly those plaguing the black community, often condoning revolutionary tactics and social activism. In the process, he directed hip-hop toward an explicitly self-aware, pro-black consciousness that became the culture's signature throughout the early 90's.

Musically, Public Enemy were just as revolutionary, as their production team, the Bomb Squad, created dense soundscapes that relied on avant-garde cut-and-paste techniques, unrecognizable samples, piercing sirens, relentless beats, and deep funk. It was chaotic and invigorating music, made all the more intoxicating by Chuck D's forceful vocals and the absurdist raps of his comic foil Flavor Flav. With his comic sunglasses and an oversized clock hanging from his neck, Flav became the group's visual focal point, but he never obscured the music.

Public Enemy's debut album, Yo! Bum Rush the Show, was released on Def Jam Records in 1987. Its spare beats and powerful rhetoric were acclaimed by hip-hop critics and aficionados, but the record was ignored by the rock and R&B mainstream. However, their second album, It Takes a Nation of Millions to Hold Us Back, was impossible to ignore. The Bomb Squad, developed a dense, chaotic mix that relied as much on found sounds and avant-garde noise as it did on old-school funk. Similarly, Chuck D's rhetoric gained focus and Flavor Flav's raps were wilder and funnier. A Nation of Millions was hailed as revolutionary by both rap and rock critics, and it was -- hip-hop had suddenly become a force for social change.