Rod interviews Elijah Wald, noted author of several excellent musical biograhies, including "Dylan Goes Electric," source material for the recent feature film "A Complete Unknown"; "Escaping The Delta" detailing the life of blues legend Robert Johnson; and "The Mayor Of MacDougal Street," a biography of folksinger Dave Van Ronk, which was the source material for the feature film "Inside Llewyn Davis." Wald, who is a well-traveled folk/blues guitarist himself, brings a veteran musician's knowledge to his thoroughly-researched works.