O
- O-TOWN
- O-ZONE
- O.A.R.
- OASIS
- OATHEAN
- OBIE TRICE
- OBITUARY
- THE OBSESSED
- OCEAN COLOUR SCENE
- OCTOBER FALL
- THE OFFSPRING
- OINGO BOINGO
- OK GO
- OLEANDER
- OLIVE
- OLIVIA NEWTON-JOHN
- OLIVIA RUIZ
- OMARION
- OMD
- ONE DOLLAR SHORT
- ONE VOICE
- ONEREPUBLIC
- ONYX
- OPETH
- OPM
- THE ORDINARY BOYS
- ORGANIZED KONFUSION
- ORGY
- ORIGINOO GUNN CLAPAZZ
- ORSON
- OST
- OTEP
- OUR LADY PEACE
- OURS
- OUTFIELD
- OUTKAST
- OUTLANDISH
- OUTLAWZ
- OVERTHROW
- OWL CITY
- OZOMATLI
- OZZY OSBOURNE