O'Donnell, Brendan
O'Leary, Dean
O.T.I.S.
Oakenfold, Paul
Oasis
Oates, John
O’Donnell, Mark
Oberst, Conor
Odom, Chriss
Oermann, Robert
Offspring, The
Ogborn, Michael
Oh No! Oh My!
OK Go
Okkevil River
Old Crow Medicine Show
Oldenburg
Oler, Kim
 Olivier, Jean Claude 'Poke'
Ollabelle
Omar, Don
Ommi
Ondrasik, John
One Less Reason
One True North
Ono, Yoko
Ophoff, Jon
Orange Park
Orbison, Roy
Organic
Organized Noise
Orishas
Orlando, Ramón
Ormandy, Simon
Orozco, Pablo
Orson
 Ortiz, Claudette
Orton, Beth
Osborne, Tom
Oscher, Paul
Osorio, Fernando
Otero, Javier
Otis, Clyde
Ottman, John
Otto, James
Overett, Adam
Overstreet, Paul
Owen, Jake
Owen, Randy
Owen, Robert
Owen, Ronald
Owens, Buck
Owens, Kelli
Ozomatli