| O TERCO | TIME TRAVELLERS | 1992 | BRA | CD |
| O YUKI CONJUGATE | PEYOTE | 1990 | UK | CD |
| JOE O'DONNELL | GAODHAL'S VISION | 1977 | IRE | LP |
| WITTOX O'HARA | THE SURREALIST | 1994 | CAN | CD |
| WITTOX O'HARA | BLAME: MASCOT | 1998 | CAN | CD |
| PATRICK O'HEARN | BETWEEN TWO WORLDS | 1987 | USA | LP |
| PATRICK O'HEARN | INDIGO | 1991 | USA | CD |
| DANNY O'KEEFE | SO LONG HARRY TRUMAN | 1975 | USA | LP |
| DANNY O'KEEFE | AMERICAN ROULETTE | 1977 | USA | LP |
| DANNY O'KEEFE | THE GLOBAL BLUES | 1979 | USA | LP |
| DANNY O'KEEFE | REDUX | 1984 | USA | CD |
| DANNY O'KEEFE | THE DAY TO DAY | 1984 | USA | LP |
| O.U. | LIVE 6/94 | 1994 | JAP | HC |
| OATS | SONS OF THE SONIC SOLUTION | 1995 | USA | CD |
| MATS OBERG & MORGAN AGREN | THE MUSIC ON THE MONEY | 1997 | SWE | CD |
| MATS OBERG & MORGAN AGREN | LIVE | 2001 | SWE | CD |
| OBLITERATI | HAVY BAUBAUS INFLIENCE | 1998 | USA | CD |
| VIDNA OBMANA | TWILIGHT OF PERCEPTION | 1996 | BEL | CD |
| VIDNA OBMANA | CROSSING THE TRAIL | 1998 | BEL | CD |
| VIDNA OBMANA | MEMORIES COMPILED | 1999 | BEL | CD |
| VIDNA OBMANA & ALLO DIE | ECHO PASSAGE | 1999 | BEL | CD |
| VIDNA OBMANA & SERGE DEVADER | THE SHAPE OF SOLITUDE | 1999 | BEL | CD |
| VIDNA OBMANA | SOUNDTRACK FOR THE AQUARIUM | 2001 | BEL | CD |
| VIDNA OBMANA | TREMOR | 2001 | BEL | CD |
| OBSCURED BY CLOUDS | BLEED | 1998 | USA | CD |
| OBVIOUS | OBVIOUS | 2000 | UK | CD |
| OCARINAH | PREMIERE VISION DE L'ETRANGE | 1978 | FRA | HC |
| BILLY OCEAN | Carribean Queen/ (Instrumental) | 1984 | UK | SP |
| BILLY OCEAN | Suddenly/ Lucky Man | 1984 | UK | SP |
| BILLY OCEAN | LOVE ZONE | 1985 | UK | PC |
| OCTAVO | DES PIEDS ET DES MAINS | 1992 | FRA | CD |
| OCTOBER | OCTOBER | 1979 | USA | CD |
| OCTOBER | AFTER THE FALL | 1980 | USA | CD |
| OCTOBRE | SURVIVANCE | 1975 | CAN | HC |
| OCTOPUS | OCTOPUS | 1969 | USA | CD |
| OCTOPUS | THE BOAT OF THOUGHTS | 1976 | GER | CD |
| OCTOPUS | THAERIE WIIGHEN | 1981 | NOR | CD |
| ODESSA | STAZIONE GETSEMANI | 1999 | ITA | CD |
| ODYSSEE | FOOLS | 1991 | GER | CD |
| OHM | OHM O2 | 1997 | USA | CD |
| OHM | VOICES | 1999 | USA | CD |
| OHM | RAW OHM | 2001 | USA | CD |
| OHO | OKINAWA | 1974 | USA | CD |
| OHO | ECCE | 1975 | USA | CD |
| OHO | VITAMIN OHO | 1975 | USA | LP |
| OHO | RECOLLECTIONS | 2002 | USA | CD |
| GUY OHRESSER | TRAVERSEE | 1997 | FRA | CD |
| OISEAU RARE | A NIGHT AT SEA | 1998 | FRA | CD |
| OJAS | SEVEN LEVELS OF MAN | 1979 | USA | HC |
| RIC OKASEC | Emotion In Motion/ P.F.J. | 1986 | USA | SP |
| OKTOBER | UHRSRUNG | 1976 | GER | HC |
| OKTOBER | THE PARISER COMMUNE | 1977 | GER | HC |
| MIKE OLDFIELD | TUBULAR BELLS | 1973 | UK | LP |
| MIKE OLDFIELD | HERGEST RIDGE | 1974 | UK | LP |
| MIKE OLDFIELD | OMMADAWN | 1975 | UK | CD |
| MIKE OLDFIELD | INCANTATIONS | 1978 | UK | CD |
| MIKE OLDFIELD | WEMBLEY ARENA 7/22/83 | 1983 | UK | CD |
| MIKE OLDFIELD | ISLANDS | 1987 | UK | CD |
| MIKE OLDFIELD | AMAROK | 1990 | UK | CD |
| MIKE OLDFIELD | TUBULAR BELLS 2 | 1992 | UK | CD |
| MIKE OLDFIELD | LIVE - ROYAL ALBERT HALL 4/5/93 | 1993 | UK | HC |
| MIKE OLDFIELD | THE SONGS OF DISTANT EARTH | 1995 | UK | CD |
| OLE LUKKOYE | CRYSTAL CROW-BAR | 2000 | RUS | CD |
| PAULINE OLIVEROS | ALIEN BOG/BEAUTIFUL SOOP | 1997 | USA | CD |
| OLYAM | ORPHEUS,THE INITIATE | 1997 | FRA | CD |
| OM ART FORMATION | THE LONG WAY | 1998 | HUN | CD |
| OM ATTACK | HEAVY RESCUE | 2000 | USA | CD |
| OMEGA PLUS | HOW TO KISS THE SKY | 1969 | FRA | HC |
| OMNI | TRAS EL PUENTE | 1993 | SPA | CD |
| OMNIA | ULTIMO GENERADOR DE EQUILIBRIO | 2000 | ARG | CD |
| OMNIA OPERA | OMNIA OPERA | 1993 | UK | CD |
| OMNIA OPERA | RED SHIFT | 1997 | UK | CD |
| 101 CRUSTACEANS | SONGS OF RESIGNATION | 1989 | USA | CD |
| ONE SHOT | LIVE-A L'OUEST DE LA GROSNE 3/5/99 | 1999 | FRA | CD |
| ONE SHOT | ONE SHOT | 1999 | FRA | CD |
| ONE SHOT | VENDREDI 13 | 2001 | FRA | CD |
| ONEIDA | A PLACE CALLED EL SHADDAI'S | 1997 | USA | CD |
| ONIRIS | L'HOMME VOILIER | 1979 | FRA | HC |
| ONLY A MOTHER | NAKED SONGS FOR CONTORTIONISTS | 1991 | USA | CD |
| ONLY A MOTHER | FERAL CHICKENS | 1995 | USA | CD |
| ONZA | REINO ROCOSO | 1991 | SPA | CD |
| OPEN AIR | OPEN AIR | 1977 | FRA | CD |
| OPHIUCUS | OPHIUCUS | 1972 | FRA | CD |
| OPTICAL MUSIC | VOLUME 2 | 1994 | GRE | HC |
| OPUS AVANTRA / DONELLA DEL MONACO | INTROSPEZIONE | 1974 | ITA | CD |
| OPUS AVANTRA | LORD CROMWELL PLAYS SUITE FOR SEVEN VICE | 1975 | ITA | CD |
| OPUS AVANTRA | STRATA | 1989 | ITA | CD |
| OPUS AVANTRA | LYRICS | 1995 | ITA | CD |
| OPUS 5 | CONTRE-COURANT | 1976 | CAN | CD |
| OPUS 5 | SERIEUX OU PAS | 1989 | CAN | CD |
| ROY ORBISON | IN DREAMS: THE GREATEST HITS | 1987 | USA | CD |
| ORCHESTRONICS | BULLS & BEARS | 1999 | USA | CD |
| OREGON | 45th PARALELL | 198? | USA | HC |
| OREGON | CROSSINGS | 198? | USA | HC |
| MARTIN ORFORD | CLASSICAL MUSIC & POPULAR SONGS | 2000 | USA | CD |
| ORGANISATION | TONE FLOAT | 1970 | GER | CD |
| ORGANIZED CHAOS | SIX FIGURES | 2000 | USA | CD |
| ORIENT SQUEEZERS | SADHU | 1999 | SWE | CD |
| ORIENTAL WIND | LIVE IN DER BALVER HOHLE | 1978 | SWE | HC |
| ORIENTAL WIND | BAZAAR | 1981 | SWE | HC |
| ORIENTAL WIND | SANKIRNA | 1985 | GER | LP |
| ORION | LA NATURE VIT, L'HOMME LUI CRITIQUE... | 1979 | FRA | CD |
| LA ORKEZTA DE LOS 13 ZALBAJES | LA ORKEZTA DE LOS 13 ZALBAJES | 2001 | MEX | CD |
| LE ORME | FELONA E SORONA | 1973 | ITA | CD |
| LE ORME | CONTRAPPUNTI | 1974 | ITA | CD |
| LE ORME | BEYOND LENG | 1975 | ITA | HC |
| LE ORME | VERITA NASCOSTE | 1976 | ITA | CD |
| LE ORME | STORIA O LEGGENDA | 1977 | ITA | CD |
| LE ORME | FLORIAN | 1979 | ITA | CD |
| LE ORME | PICCOLA RAPSODIA DELL'APE | 1980 | ITA | CD |
| LE ORME | IL FIUME | 1996 | ITA | CD |
| ORPHAN MOON | HAVE A LITTE FAITH | 1996 | USA | CD |
| OSAGE TRIBE | ARROW HEAD | 1972 | ITA | CD |
| OSANNA | MILANO CALIBRO 9 | 1972 | ITA | HC |
| OSANNA | PALEPOLI | 1973 | ITA | CD |
| OSANNA | LANDSCAPE OF LIFE | 1980 | ITA | CD |
| JEFFREY OSBORNE | You Should Be Mine/ Who Would Have Guess | 1986 | USA | SP |
| OSE | ADONIA | 1978 | FRA | LP |
| OSHYNA | TIMECOIL | 1994 | USA | PC |
| OSIRIS | OSIRIS | 1982 | BAH | CD |
| OSIRIS | MYTHS & LEGENDS | 1984 | BAH | CD |
| OSIRIS | REFLECTIONS | 1998 | BAH | CD |
| OSJAN | ROOTS | 1982 | POL | LP |
| LEE OSKAR | LEE OSKAR | 1976 | USA | LP |
| LEE OSKAR | BEFORE THE RAIN | 1978 | USA | LP |
| OSKAY & O'DOMHNAILL | NIGHTNOISE | 1984 | IRE | LP |
| OSKAY & O'DOMHNAILL/NIGHTNOISE | SOMETHING OF TIME | 1987 | IRE | LP |
| OSKORRI | ADIO KATTALINA | 197? | SPA | HC |
| DONNY OSMOND | THE BEST OF DONNY OSMOND | 1980 | USA | PC |
| OSSATURA & TIM HODGKINSON | DENTRO | 1998 | ITA | CD |
| OSSIAN | KSIEGA CHMUR I | 1976 | POL | HC |
| MATTHEW OSTROWSKI | VERTEBRA | 1999 | USA | CD |
| THE OTHER SIDE | IN THE SHADOWS | 1994 | USA | DT |
| THE OTHER SIDE | DEMO '97 | 1997 | USA | HC |
| OTOLITHEN | S.O.D. | 1997 | HOL | CD |
| OUR LADY PEACE | NAVEED | 1994 | CAN | CD |
| OUR LADY PEACE | CLUMSY | 1997 | CAN | CD |
| OUT OF FOCUS | FOUR LETTER MONDAY AFTERNOON | 1972 | GER | DT |
| OUT OF FOCUS | NOT TOO LATE | 1974 | GER | CD |
| OUTER LIMITS | OUTER MANIA | 1984 | JAP | CD |
| OUTER LIMITS | MISTY MOON | 1985 | JAP | CD |
| OUTER LIMITS | A BOY PLAYING THE MAGICAL BUGLE HORN | 1986 | JAP | CD |
| OUTER LIMITS | THE SCENE OF PALE BLUE | 1987 | JAP | CD |
| OUTER LIMITS | THE SILVER APPLES ON THE MOON | 1987 | JAP | CD |
| OUTER LIMITS | LIVE - 1988 | 1988 | JAP | HC |
| THE OUTFIELD | PLAY DEEP | 1985 | UK | LP |
| THE OUTFIELD | BANGIN' | 1987 | UK | LP |
| OVERDRIVE | THE HUMAN MACHINE | 1990 | ITA | CD |
| OVERFLOWER | WATER ON MARS | 2001 | USA | CD |
| OVNI | 1986-1991 | 1991 | | HC |
| OVNI | ENTRE SERES Y SUS RAICES | 2000 | | CD |
| OYSTERBAND | HERE I STAND | 1999 | UK | CD |
| THE OZARK MOUNTAIN DAREDEVILS | THE OZARK MOUNTAIN DAREDEVILS | 1973 | USA | LP |
| THE OZARK MOUNTAIN DAREDEVILS | THE CAR OVER THE LAKE ALBUM | 1975 | USA | LP |
| OZONE PLAYER | INSANE LOGIC | 2000 | FIN | CD |
| OZONE QUARTET | FRESH BLOOD | 1997 | USA | CD |
| OZONE QUARTET | NOCTURNE | 1999 | USA | CD |
| OZRIC TENTACLES | TREWORY TREE FESTIVAL - 7/24/84 | 1984 | UK | HC |
| OZRIC TENTACLES | ERPSONGS | 1985 | UK | CD |
| OZRIC TENTACLES | NOSHER'S FARM, UK - 8/8/85 | 1985 | UK | HC |
| OZRIC TENTACLES | TANTRIC OBSTACLES | 1985 | UK | CD |
| OZRIC TENTACLES | LIVE ETHEREAL CEREAL | 1986 | UK | CD |
| OZRIC TENTACLES | THERE IS NOTHING | 1987 | UK | CD |
| OZRIC TENTACLES | SLIDING GLIDING WORLDS | 1988 | UK | CD |
| OZRIC TENTACLES | THE BITS BETWEEN THE BITS | 1989 | UK | CD |
| OZRIC TENTACLES | PUNGENT EFFULGENT | 1989 | UK | CD |
| OZRIC TENTACLES | SUFFERING SEGMENTS | 198? | UK | HC |
| OZRIC TENTACLES | ERPLAND | 1990 | UK | CD |
| OZRIC TENTACLES | AFTERSWISH | 1991 | UK | CD |
| OZRIC TENTACLES | STRANGEITUDE | 1991 | UK | CD |
| OZRIC TENTACLES | UNDERSLUNKY | 1991 | UK | CD |
| OZRIC TENTACLES | JURASSIC SHIFT | 1993 | UK | CD |
| OZRIC TENTACLES | ARBORESCENCE | 1994 | UK | CD |
| OZRIC TENTACLES | KENNEL CLUB - SAN FRANCISCO 4/29/94 | 1994 | UK | DT |
| OZRIC TENTACLES | BECOME THE OTHER | 1995 | UK | CD |
| OZRIC TENTACLES | CURIOUS CORN | 1997 | UK | CD |
| OZRIC TENTACLES | LIVE AT THE FILLMORE 6/5/98 | 1998 | UK | CD |
| OZRIC TENTACLES | SPICE DOUBT STREAMING | 1998 | UK | CD |
| OZRIC TENTACLES | WATERFALL CITIES | 1999 | UK | CD |
| OZRIC TENTACLES | SWIRLY TERMINATION | 2000 | UK | CD |
| OZRIC TENTACLES | THE HIDDEN STEP | 2000 | UK | CD |
| OZRIC TENTACLES | THE NAPSTER TAPES VOL.1 | 2000 | UK | CD |
| OZRIC TENTACLES | THE NAPSTER TAPES VOL.2 | 2000 | UK | CD |