In this episode's tribute to country and bluegrass artists, hear from the Grand Ole Opry's Appalachian folk-inspired Charlie Louvin and the "Okie From Muskogee," Merle Haggard.
World Cafe's 20th-anniversary celebration continued with a look back at Costello's many appearances on the show, including a conversation with collaborator Allen Toussaint about their post-Katrina tribute.