O Sister!A
Oak Ridge Boys, TheFOTW
Obray RamseyFO
OceanW
OdettaC
Ojai Valley BoysCS
Oklahoma Thunder Band, TheR
Oklahoma Wranglers (Willis Bros.)H
Ola Belle ReedI
Old 86M
Old & In The WayDT
Old Goat, The & TommyI
Old, Old Story, TheO
Old Time Jubilee SingersW
Old Village ChoirBW
Olive BiceR
Oliver Rice & The Blue Ridge Mountain BoysN
Olivia Newton-JohnBW
Ollie AustinB
Ólöf ArnaldsP
Open HighwayN
Opryland Gospel QuartetI
Orange Blossom BluegrassI
Orchester Anthony VenturaS
Original FormulaL
OrionS
Oriskany Strings, TheW
Osborne Brothers, TheFIL
Osborne Brothers & Mac WisemanP
Oscar PetersonA
Östen mä restenB
Ottar 'Big Hand' JohansenW
Owen BlundellO
Owen GrayS
Ozark AllianceI