Jerry Douglas, Paul Simon and Mumford & Sons

Old Crow Medicine Show, Joel Rafael, Jimmy LaFave, Donovan, Rosanne Cash, John Leventhal, Sweet Honey in the Rock, Lucinda Williams, Judy Collins, Tom Morello, Ani DiFranco, Ry Cooder, Dan Gellert, Jackson Browne, The Del McCoury Band, Tony Trischka, Tim O'Brien, John Mellencamp and Ramblin' Jack Elliott

Good Rockin' Dopsie And The Twisters and Paul Simon

The Chieftains and Bon Iver

Bonnie Raitt, Jackson Browne, Bruce Hornsby, Bryan Adams and Kim Wilson

Allen Toussaint, Gregg Allman, Joan Osborne, Garth Hudson, Joe Walsh, John Hiatt, John Mayer, John Prine, Jorma Kaukonen, Larry Campbell, Lucinda Williams, Jakob Dylan, Marc Cohn, Mavis Staples, Teresa Williams, Eric Church, The Levon Helm Band, Justin Guip, Byron Isaacs, G. E. Smith, Roger Waters, Warren Haynes, Bruce Hornsby, My Morning Jacket, Grace Potter, Amy Helm, Barry Mitterhoff, Robert Randolph, Ray Lamontagne, David Bromberg and Dierks Bentley