Johnny Cash was an American singer, songwriter and guitarist who became one of the defining figures of twentieth-century country music. Recognizable for his deep voice and stripped-down style, he blended country, folk, gospel, rockabilly and blues in songs exploring faith, love, guilt, prison life and people living on the margins of society. With songs such as I Walk the Line, Ring of Fire and Folsom Prison Blues, along with his famous live prison recordings, Johnny Cash left a lasting mark on American popular music.