When Public Enemy released It Takes a Nation of Millions to Hold Us Back, in 1988, it was as if the album had landed from another planet. Nothing sounded like it at the time. It Takes a Nation came frontloaded with sirens, squeals, and squawks that augmented the chaotic, collaged backing tracks over which P.E. frontman Chuck D laid his politically and poetically radical rhymes. He rapped about white supremacy, capitalism, the music industry, black nationalism, and--in the case of "Caught, Can I Get a Witness?"-- digital sampling. [more]