John R. "Johnny" Cash (February 26, 1932 – September 12, 2003), born J. R. Cash, was an American singer-songwriter, actor and author, who has been called one of the most influential musicians of the 20th century. In a career that spanned almost five decades, Cash was the personification of country music to many people around the world. He recorded songs that could be considered rock and roll, blues, rockabilly, folk, and gospel, and exerted an influence on each of those genres. Moreover, he had the unique distinction among country artists of having "crossed over" late in his career to become popular with an unexpected audience, young indie and alternative rock fans. Much of Cash's music, especially that of his later career, echoed themes of sorrow, moral tribulation and redemption. His signature songs include "I Walk the Line", "Folsom Prison Blues", "Ring of Fire", "Get Rhythm" and "Man in Black".