- The Jenkins -- The John Jorgenson Bluegrass Band
- The Johnny Staats Project -- The Josh Turner Tribute Band
- The Judds -- The Kendalls
- The Kentucky Colonels -- The Kettle Sisters
- The Ketuckians -- The Kings Of Mongrel Folk
- The Kinleys -- The Lacs
- The Lancaster Orchestra -- The Last Ride
- The Last Straw -- The Lewis & Clarke Expedition
- The Lewis Family -- The Linemen
- The Linfords -- The Lomax
- The London Opera Chorus -- The Long Goners
- The Loose Salute -- The Louvin Brothers
- The Lovell Sisters -- The Lucky Tomblin Band
- The Lumineers -- The Maqueraders
- The Marcy Brothers -- The Martins
- The Maryhillbillys -- The Mavericks
- The McAllister Family -- The McKrells
- The McLains -- The Melroys
- The Men They Couldn't Shave -- The Mighty Lumberhorn
- The Mighty One -- The Mississippi 'Possum Hunters
- The Modern Mountaineers -- The Monroe Brothers