Oak Ridge Boys, The	F	I	O	T	W
Obray Ramsey	F
OC Times	H
Odetta	C
Off Beat	H
Off The Wall Blues Band	J
Offenders	H
Ojai Valley Boys	C	S
Oklahoma Thunder Band, The	R
Oklahoma Wranglers (Willis Bros.)	H
Ola Belle Reed	I	M
Old & In The Way	D	T
Old, Old Story, The	O
Old Crow Medicine Show	I
Old Dogs, The	I
Old 15 South	C
Old Goat, The & Tommy	I
Old Gold Singers (University of Iowa)	J
Old Metropolitan Band	J
Old Time Jubilee Singers	W
Old Village Choir	B
Ole Mississippi Marching Band	I
Olive Bice	R
Oliver Kane	C	I
Oliver Rice & The Blue Ridge Mountain Boys	N
Olivia Newton-John	B
Ollie	I
Ollie Austin	B	H	J	L	Y
Ólöf Arnalds	P
Omegas	N
O'Neill Duo	A
1 Voice	I
Oneil Devost	C
Onset, The	M
Oompie Koerier	J
Open Highway	N
Open Road	H
Opryland Gospel Quartet	I
Orange Blossom Bluegrass	I
Orchester Anthony Ventura	S
Original Cast	J
Original Formula	L
Orion	C	N	S
Oriskany Strings, The	W
Os Chefes	J
Osborne Brothers	A	F	K	I	L	M	T	Y
Osborne Brothers & Mac Wiseman	P
Osborne Brothers & Red Allen	L
Oscar Tellez	T
Östen mä resten	B
Otis Read	I
Ottar 'Big Hand' Johansen & Lillian Askeland	I
Outpost Scotty & Bar X Boys	M
Overdrive	C
Owen Blundell	O
Owen Bradley	M
Owen Gray	S
Owen Temple	I	L
Ozark Alliance	I

---