O-Town	Conan O'Brien	Marty O'Brien	Obituary	The Ocean
Of A Revolution (O.A.R.)	Of Mice & Men	The Offspring	(ohlm)	On a Pale Horse
On the Shoulder of Giants	OneSideZero	One Republic	Only Seven Left	Open Skyz
Opeth	Orgy	Orianthi	Orphaned Land	Kelly Osbourne
Ozzy Osbourne	Otep	The Other	The Other Half	Our Lady Peace
Outta Time	Overkill	Tim 'Ripper' Owens	Owl City