O: popular
- O Brother, Where Art Thou? soundtrack
- O-shen
- O-Zone
- Oasis
- OBK
- Ocean Colour Scene
- Odyssey
- Offenbach
- Office Space soundtrack
- Official
- Official Cammie
- Offspring
- Ofra Haza
- Ogie Alcasid
- Oklahoma soundtrack
- Ol' Dirty Bastard
- Oldies Songs
- Oleta Adams
- Oliva N. Rabarioelina
- Oliver Age 24 (YouTube)
- Oliver and Company soundtrack
- Oliver! soundtrack
- Olivia
- Olivia Newton John
- Olivia O'Brien
- Olivia Rodrigo
- Olly Murs
- Olmeca
- Omarion
- On Ember
- On the Town soundtrack
- Once on This Island soundtrack
- Once Upon A Mattress soundtrack
- One Direction
- One Fine Day soundtrack
- One Tree Hill soundtrack
- Oran "Juice" Jones
- Orange County soundtrack
- Orishas
- Oscar Brand
- Oscar Medina
- Otis Redding
- Our Lady Peace
- Out Cold soundtrack
- Out Of Eden
- Oystein Sunde
- Ozomatli
- Ozzy Osbourne