By Willie Nelson, The Avett Brothers, Bobby Bare, Chris Stapleton, Dave Matthews, Emmylou Harris, Eric Church, George Strait, Jack Johnson, Jamey Johnson, Jimmy Buffett, Kris Kristofferson, Lee Ann Womack, Lukas Nelson, Lyle Lovett, Margo Price, Micah Nelson, Nathaniel Rateliff, Norah Jones, The Little Willies, Ray Benson, Sheryl Crow, Steve Earle, Susan Tedeschi, Derek Trucks, Vince Gill