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Nitty Gritty Dirt Band, Johnny Cash (voc, g), The Carter Family, John Prine, Levon Helm, Ricky Skaggs, John Denver, Emmylou Harris, Jimmy Martin, Paulette Carlson, Michael Martin Murphey, John Hiatt, Roger McQuinn, Chris Hillman, Bruce Hornsby, Roy Acuff (voc), Chet Atkins, Randy Scruggs (g), Earl Scruggs (bjo), New Grass Revival ..