O'CONNOR, SINEAD O'DAY, ALAN O'JAYS, THE O'KAYSIONS, THE O'NEAL, JAMIE O'NEIL, MELISSA O'RIORDAN, DOLORES O'RYAN O'SULLIVAN, GILBERT O-TOWN O-ZONE O.A.R. (OF A REVOLUTION) O.C. SMITH OAK RIDGE BOYS, THE OAKENFOLD, PAUL OASIS OATES, JOHN AND DARYL HALL OBIE TRICE OCEAN OCEAN, BILLY OCTOBER FALL ODYSSEY OFFSPRING, THE OHIO EXPRESS, THE OHIO PLAYERS OK GO OL' DIRTY BASTARD OLDFIELD, MIKE OLEANDER OLIVER OLIVIA OLIVIA NEWTON-JOHN OLLIE & JERRY OLSTEAD, RENEE OMARION ONE CHANCE ONE TRUE VOICE ONE VOICE ONO, YOKO & JOHN LENNON OPM ORBISON, ROY the ORDINARY BOYS ORGY ORIGINAL ANIMALS, THE ORIGINAL SAVANNAH BAND (DR. BUZZARD'S) ORIGINALS, THE AND ROSIE ORLANDO, TONY AND DAWN ORLEANS ORLONS, THE ORRICO, STACIE ORSON ORTEGA, JEANNIE OSBOURNE, KELLY OSBOURNE, OZZY OSCAR BENTON OSMOND, DONNY OSMOND, DONNY AND MARIE OSMONDS, THE OTEP OTIS REDDING OUR GANG & SPANKY OUR LADY PEACE OURS OUTKAST OUTLANDISH OUTSIDERS, THE OWEN, MARK OXIDE & NEUTRINO OZARK MOUNTAIN DAREDEVILS, THE OZMA OZZY OSBOURNE