Johnny Cash hardly needs an introduction; the American-born singer and songwriter was known for his deep voice and defiant persona. During his lifetime and after his death, he became one of the most influential icons in American music history. His many successful songs, such as "One Piece At A Time" and "Ring of Fire", have added to his credentials as a raw storyteller and musician with deep emotional depth. Ironically, one of his most iconic songs, "I Walk The Line", was also his least favorite track.