9 Alan Jackson Alison Krauss & Union Station Amy Grant Barbara Mandrell Billy Strings Brad Paisley Brooks & Dunn Dan Fogelberg Dan Seals David Nail Dierks Bentley Earl Thomas Conley Elvis Costello Faith Hill Garth Brooks Gary Morris Hal Ketchum Joe Diffie Joe Diffie Joe Nichols Joe Nichols John Fogerty Kathy Mattea Little Big Town Lynyrd Skynyrd Mumford & Sons Pam Tillis Parker McCollum Patty Loveless Paul Simon Randy Travis Reba McEntire Renée Fleming Sara Evans Sarah Jarosz Swamp Dogg T Bone Burnett The Civil Wars Tommy Shaw Trisha Yearwood Vince Gill