Roy Acuff was called the King of Country Music, and for more than 60 years he lived up to that title. If any performer embodied country music, it was Roy Acuff. Throughout his career, Acuff was a champion for traditional country values, enforcing his beliefs as a performer, a music publisher, and as the Grand Master of the Grand Ole Opry. Acuff was the first country music superstar after the death of Jimmie Rodgers, pioneering an influential vocal style that complemented the spare, simple songs he was performing. Generations of artists, from Hank Williams to George Jones, have...