Arşivlik Progressive Albümler "O" 1980 e kadar

O'Terço - Terço II (1973) BR
O'Terço - Casa encantada BR 1975
O'Terço - Preferencia Nacional BR 1976
O'Terço - Criaturas da Noite BR 1975
Oberon - A Midsummer's Night Dream 1971 UK
Ocean - God's Clown 1976, France
October Country - October Country 1968, USA
Octobre - Les Nouvelles Terres 1974 CAN
Octobre - Survivance 1975 CAN
Octopus - Restless Night 1970 UK
Octopus - The Boat Of Thoughts 1976 GER
Octopus - An Ocean Of Rocks, 1977
Okko - Sitar and Electronics HOL 1971
Odin - Odin 1972 GER
Odissea - Odissea, 1973 IT
Odmenn - Odmenn (1970) ICELAND
Odyssee - same (ger 71)
Odyssee - White Swan (ger 1978)
Odyssey - Setting Forth (1969 USA)
Oho - Okinawa 1974 USA
Oho - Vitamin Oho 1976 USA
Oko - Raskorak Yug 1976
Oktober - Uhrsprung 1976 GER
Oktober - Die Pariser Commune 1977 GER
Old Man & The Sea - The Old Man & The Sea (dk 73)
Old man and the sea, the - second album (dk 73)
Om - Om 1971, Spain (Catalan)
Omega - Éjszakai országút 1970 HUN
Omega - 200 Years After the Last War [English Lyrics] 1974 HUN
Omega - The Hall of Floaters in the Sky 1975 HUN
Omega - Time Robber 1976 HUN
Omega - Skyrover 1978 HUN
Omega - Gammapolis 1979 HUN
One - Come (1972 US)
Opa - Magic Time 1977 uruguay
Opa - Golden Wings 1976 uruguay
Opus 5 - Contre Courant 1976 CAN
Opus Alpha - Opus Alpha 1972 Uruguay
Opus Avantra - intropsezione 1974 IT
Opus Avantra - Lord Cromwell 1975 IT
Ora - Ora 1969 UK
Orange Peel - Orange Peel 1970, Germany
Orange Wedge - Orange Wedge 1972, USA
oregon - music of another present era 1972 USA
oregon - winter light USA, 1974
oregon - out of the woods 1978, USA
Orion's Beethoven - Super Angel 1970, Argentina
Orient Express, The - The Orient Express 1968 (Iran, Fra & Bel)
Oriental Sunshine - Dedicated To The Bird We Love 1970, Norway
Os Mundi - Latin Mass, (ger 70 )
Os Mundi - 43 Minuten (ger 72)
Os Mutantes - A Divina Com Dia Ou Ando Meio 1970 Brazil
Os Mutantes - Ao Vivo Brazil
Os Mutantes - Tudo foi feito pelo Sol 1975 Brazil
Os Mutantes - O A e o Z 1973 Brazil
Os Mutantes - Os Mutantes 1968 Brazil
Osage Tribe - Arrow Head 1972 Brazil
Osanna - Landscape Of Life (IT)
Osanna - L'Uomo (IT)
Osanna - Milano Calibro 9 1972 (IT)
Osanna - Palepoli (IT)
Ose - Adonia 1978 FR
Osjan - Ksiega chmur 1979 Pol
Osjan - Ksiêga Deszczu 1975 Pol
Osibisa - Woyaya UK/African
Ougenweide - All die weil ich mag Ger 1974
Ougenweide - Ousflug Ger 1979,
Out Of Focus - Four Letter Monday Afternoon Ger 1972
Out Of Focus - Out Of Focus Ger 1971
Out Of Focus - Wake Up Ger 1970
Out Of Focus - Not Too Late 1974 Ger
Out Of Focus - Rat Roads 1972 Ger
Oz Knozz - Ruff Mix 1975, USA