Alison Krauss Nickel Creek Gillian Welch Punch Brothers Chris Thile Woody Guthrie Lucinda Williams Emmylou Harris The Be Good Tanyas Hank Williams Sr. Patty Griffin Steve Earle Bill Monroe Ralph Stanley The Carter Family Union Station Doc Watson Kasey Chambers Dixie Chicks Iris Dement Po Girl Brandi Carlile The Wailin' Jennys Les Paul Indigo Girls Tony Rice Dar Williams Jerry Garcia Ricky Skaggs Neko Case Blind Boys Of Alabama Bonnie Raitt Norah Jones Old Crow Medicine Show James Taylor Lucy Kaplansky Sheryl Crow Crosby, Stills And Nash Sarah Jarosz The Seldom Scene The Weepies Brandi Carlyle Hem Del Mccoury Sam Bush Sarah Mclachlan Bob Weir Richard Shindell John Gorka