Conor Oberst, Daniel Lanois, Herb Pedersen, John Starling, Kris Kristofferson, Mavis Staples, Rodney Crowell, Steve Earle, Vince Gill, Alison Krauss, Buddy Miller, Chris Hillman, Emmylou Harris, Holly Williams, Lucinda Williams, Lee Ann Womack, Mary Chapin Carpenter, Martina McBride, Patty Griffin, Sheryl Crow, Shawn Colvin, Sara Watkins, Trampled by Turtles, The Milk Carton Kids, Iron & Wine, Shovels & Rope, Chris Coleman