<p>Tupac Shakur is not just a posthumous hip-hop icon. In the years since his September 1996 murder, he has attained a status that led some to coin him 'the Black Elvis'. More successful as a recording artist than at the active peak of his career, his posthumous albums continue to sell in massive quantities around the world. His cultural importance is reflected in a 'Tupac's not dead' myth - the first time a black perform...