The legendary singer, songwriter and political activist talks to Terry about his new book Roots, Radicals and Rockers: How Skiffle Changed the World. Bragg describes Skiffle as the music that "was the nursery for the British invasion of the American/Canadian charts of the 1960s." The book traces the influence of Lonnie Donegan, known as the King of Skiffle, on music icons like The Beatles, and Van Morrison.