Significantly, country music star Johnny Cash's career coincided with the birth of rock 'n' roll. Cash's music reflected the rebellious outlaw spirit of early rock, despite the fact that it did not sound much like the new genre or, for that matter, even like traditional country music. Something that perhaps best sums up his image is a famous picture of Cash, with a guitar slung around his neck and an indignant look on his face giving the middle finger to the camera. As the self-dubbed "Man in Black," Johnny Cash has evolved from a Nashville outsider into an American icon who did not have to trade his mass popularity for a more mainstream, non-country sound. Despite a number of setbacks, the most prominent of which was a debilitating addiction to pills and numerous visits to jail, Cash has maintained his popularity since releasing his...