John R. "Johnny" Cash" was an American singer-songwriter, actor, and author, who has been called one of the most influential musicians of the 20th century. Although he is primarily remembered as a country music artist, his songs and sound spanned many other genres including rockabilly and rock and roll—especially early in his career—as well as blues, folk, and gospel. Late in his career, Cash covered songs by several rock artists, among them the industrial rock band Nine Inch Nails and the synthpop band Depeche Mode.
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". He also recorded humorous numbers, such as "One Piece at a Time" and "A Boy Named Sue"; a duet with his future wife, June Carter, called "Jackson"; as well as railroad songs including "Hey, Porter" and "Rock Island Line".