At the outset of summer in 1990, a Houston gangsta rap group called the Geto Boys was poised to debut its self-titled third album under the guidance of hip-hop guru Rick Rubin. What might have been a low-profile remix release from a little-known corner of the rap universe began to make headlines when the album's distributor refused to work with the group, citing its violent and depraved lyrics. When The Geto Boys was finally released, chain...