Johnny Cash, who was known as "The Man In Black", was an American country singer and songwriter and 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 as well as blues, folk, and gospel. This crossover appeal led to Cash being inducted in the Country Music Hall of Fame, the Rock and Roll Hall of Fame, and Gospel Music Hall of Fame. Late in his career, Cash covered songs by several rock artists.
Cash was known for his deep, distinctive bass-baritone voice, the "boom-chicka-boom" sound of his Tennessee Three backing band, his rebelliousness coupled with an increasingly somber and humble demeanor, for providing free concerts inside prison walls and for his dark performance clothing. Later in his music career, his songs 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, including "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".
Cash declared that he was "the biggest sinner of them all", and viewed himself overall as a complicated and contradictory man. Accordingly, Cash is said to have "contained multitudes", and has been deemed "the philosopher-prince of American country music".