| Gruppe | Album | Jahr | Art | Stil | Bemerkg. |
O |
| Obituary | The end complete | 1992 | CD | Metal | Vorhanden |
| Obituary | World demise | 1994 | CD | Metal | Vorhanden |
| Oldfield, Mike | Tubular bells | 1973 | CD | Rock | Vorhanden |
| Oldfield, Mike | Exposed (live) | 1979 | CD | Rock | Vorhanden |
| Oldfield, Mike | Tubular bells II | 1992 | CD | Rock | Vorhanden |
| Omen | The curse / Nightmares | 1986 | CD | Metal | Vorhanden |
| Omen | Battle cry | 1987 | CD | Metal | Vorhanden |
| Omen | Warning of danger / Nightmares | 1987 | CD | Metal | Vorhanden |
| Omen | Escape to nowhere | 1988 | CD | Metal | Vorhanden |
| Omen | Teeth of the hydra | 1989 | CD | Metal | Vorhanden |
| One Minute Silence | Promo - Autumn 1997 European tour CD | 1997 | MCD | Metal | Vorhanden |
| Onslaught | Power from hell | 1985 | CD | Metal | Vorhanden |
| Onslaught | The force | 1986 | CD | Metal | Vorhanden |
| Onslaught | In search of sanity | 1988 | CD | Metal | Vorhanden |
| Osbourne, Ozzy | Blizzard of Oz | 1980 | CD | Metal | Vorhanden |
| Osbourne, Ozzy | Diary of a madman | 1981 | CD | Metal | Vorhanden |
| Osbourne, Ozzy | Speak of the devil (live) | 1982 | CD | Metal | Vorhanden |
| Osbourne, Ozzy | Bark at the moon | 1983 | CD | Metal | Vorhanden |
| Osbourne, Ozzy | The ultimate sin | 1986 | CD | Metal | Vorhanden |
| Osbourne, Ozzy | No rest for the wicked | 1988 | CD | Metal | Vorhanden |
| Osbourne, Ozzy | No more tears | 1991 | CD | Metal | Vorhanden |
| Osbourne, Ozzy | Ozzmosis | 1995 | CD | Metal | Vorhanden |
| Overkill | Feel the fire | 1985 | CD | Metal | Vorhanden |
| Overkill | Taking over | 1987 | CD | Metal | Vorhanden |
| Overkill | Under the influence | 1988 | CD | Metal | Vorhanden |
| Overkill | The years of decay | 1989 | CD | Metal | Vorhanden |
| Overkill | Horrorscope | 1991 | CD | Metal | Vorhanden |
| Overkill | I hear black | 1993 | CD | Metal | Vorhanden |
| Overkill | W.F.O. (Wide fucking open) | 1994 | CD | Metal | Vorhanden |
| Overkill | The killing kind | 1996 | CD | Metal | Vorhanden |
| Overkill | From the underground and below | 1997 | CD | Metal | Vorhanden |