Johnny Cash was one of the most imposing and influential figures in post-World War II country music. With his deep, resonant baritone and spare, percussive guitar, he had a basic, distinctive sound. Cash didn't sound like Nashville, nor did he sound like honky tonk or rock & roll. He created his own subgenre, falling halfway between the blunt emotional honesty of folk, the rebelliousness of rock & roll, and the world weariness of country. Cash's career coincided with the birth of rock & roll, and his rebellious attitude and simple, direct musical attack shared a lot of similarities with rock. However, there was a deep sense of history -- as he would later illustrate with his series of historical albums -- that kept him forever t...