| Name | # Files | Name | # Files | Name | # Files | ||
|---|---|---|---|---|---|---|---|
| O'Carolan | 55 | Oasis | 37 | Obliveon | 2 | ||
| Ocean Colour Scene | 5 | Offspring | 15 | Oldfield Mike | 7 | ||
| Oleander | 1 | ONA | 1 | Onix | 7 | ||
| Opium | 1 | Orbison Roy | 2 | Orgy | 2 | ||
| Os Replicantes | 1 | Osborne Sonny | 1 | Osbourne Joan | 2 | ||
| Outlaws | 1 | Overkill | 1 | Ozzy Osbourne | 29 |