O.A.K.
– Giordano Bruno (2018) NOT RATED
Oak
– Lighthouse (2013) NOT RATED
Oberon
– Dream Awakening (2014) NOT RATED
Oblivion Sun
– Oblivion Sun (2007) 4.00 stars
– The High Places (2013) 3.50 stars
Obsession
– Scarred for Life (1986) 3.00 stars
– Methods of Madness (1987) 3.50 stars
Ocean
– God’s Clown (1976) NOT RATED
Ocean Machine
– Biomech (1997) NOT RATED
Oceans of Time
– Faces (2012) 4.00 stars
October Tree
– The Fairy’s Wing (2012) NOT RATED
Octopus (DE)
– The Boat Of Thoughts (1977) NOT RATED
Octopus (USA)
– Octopus (1969) NOT RATED
Odd Dimension
– Symmetrical (2011) 3.50 stars
Odd Logic
– Legends of the Monta Part I (2006) 4.00 stars
– Legends of Monta: Part II (2009) 4.00 stars
– Over the Underworld (2011) 3.50 stars
– Penny for Your Thoughts (2016) 4.00 stars
– Effigy (2017) NOT RATED
Odin
– Odin (1972) NOT RATED
Odin’s Court
– Deathanity (2008) NOT RATED
– Human Life In Motion (2011) NOT RATED
– Appalachian Court (2012) NOT RATED
– The Warmth Of Mediocrity (2013) NOT RATED
– Turtles All the Way Down (2016) NOT RATED
Odyssee
– White Swan (1978) NOT RATED
Odyssey
– Odyssey (1999) 3.50 stars
– Reinventing the Past (2010) 3.50 stars
Odyssice
– Silence (2010) NOT RATED
Off Broadway
– On (1979) 2.50 stars
– Quick Turns (1980) 3.00 stars
Old Blood
– Old Blood (2016) 4.00 stars
Ollocs
– Soul Theory (2016) NOT RATED
Om
– Om (1971) NOT RATED
Omega
– Omega (1973) 4.00 stars
– Omega III (1974) 3.50 stars
– The Hall of Floaters in the Sky (1975) 4.00 stars
On The Raw
– Big City Awakes (2017) NOT RATED
Once & Future Band
– Once & Future Band (2017) NOT RATED
Oneira
– Hyperconscious (2014) 4.00 stars
Onevoice
– To Mold This Morning’s Clay (2014) NOT RATED
– Unexpected Union (2017) NOT RATED
Ontofield
– Sleeping With Fractals (2013) NOT RATED
Onysus
– Dyosun: Between Two Worlds (2018) NOT RATED
Opening Scenery
– Mystic Alchemy (2011) 3.50 stars
Opera Oscura
– Disincanto (2017) NOT RATED
Operation: Mindcrime
– Resurrection (2016) NOT RATED
– The New Reality (2017) NOT RATED
Opeth
– Heritage (2011) 3.50 stars
– Pale Communion (2014) 3.50 stars
Opus of a Machine
– Simulacra (2014) NOT RATED
Orang-Utan
– Orang-Utan (1970) 4.00 stars
Orange Peel
– Orange Peel (1970) 4.00 stars
Oraton
– Concentric Circles (2017) NOT RATED
Orchid
– Through The Devil’s Doorway (2009) 4.00 stars
– Capricorn (2011) 4.00 stars
– Heretic (2012) NOT RATED
– Wizard Of War (2013) NOT RATED
Orden Ogan
– Vale (2008) 4.00 stars
– Easton Hope (2010) 4.00 stars
Oregon
– Winter Light (1974) NOT RATED
– Ecotopia (1987) NOT RATED
Organisation
– Tone Float (1970) NOT RATED
Orion
– La Nature Vit, L’Homme Lui Critique… (1979) NOT RATED
– La face visible (2015) 2.50 stars
– Le Survivant (2017) NOT RATED
Orion Dust
– Legacy (2018) NOT RATED
Orion the Hunter
– Orion the Hunter (1984) 3.50 stars
Orion’s Reign
– Nuclear Winter (2008) 2.00 stars
Orissa
– Resurrection (2016) NOT RATED
Le Orme
– Collage (1971) 3.50 stars
– Uomo di pezza (1972) 3.50 stars
– Felona e Sorona (1973) 4.00 stars
– Contrappunti (1974) NOT RATED
Orne
– The Conjuration by the Fire (2006) 4.00 stars
Orphan Project
– Spooning Out the Sea (2009) 3.50 stars
Osada Vida
– Three Seats Behind a Triangle (2006) 3.00 stars
– The Body Parts Party (2008) 3.50 stars
– Uninvited Dreams (2009) 4.00 stars
– The After-Effect (2014) 4.00 stars
Osage Tribe
– Hypnosis (2013) NOT RATED
Osanna
– L’uomo (1971) 4.00 stars
– Palepoli (1973) 4.00 stars
– Landscape of Life (1974) 4.00 stars
– Suddance (1978) NOT RATED
– Palepolitana (2015) 4.00 stars
Ostura
– The Room (2018) NOT RATED
The Othello Syndrome
– The Shadow of Dreams (1999) 4.00 stars
Out of Focus
– Wake Up! (1970) NOT RATED
Out of the Beardspace
– Out of the Beardspace III (2012) NOT RATED
– Endless Pursuit (2017) NOT RATED
Outer Limits
– Misty Moon (1985) NOT RATED
Outlander
– Outlander (2001) NOT RATED
– Outlander II (2007) NOT RATED
Outlaw Blood
– Outlaw Blood (1991) 3.50 stars
Outloud
– Love Catastrophe (2011) 4.00 stars
Outside
– Freedom (2002) 3.50 stars
– Naked (2016) 2.00 stars
Outside Edge
– Running Hot (1986) 3.50 stars
– Call Me (1991) 3.50 stars
– More Edge (2000) 3.50 stars
Outworld
– Outworld (2006) 4.50 stars
Overhead
– Zumanthum (2002) 4.00 stars
– Metaepitome (2005) 4.00 stars
– And We’re Not Here After All (2008) NOT RATED
– Of Sun And Moon (2012) NOT RATED
– Haydenspark (2018) NOT RATED
Overland
– Break Away (2008) 4.00 stars
– Diamond Dealer (2009) 4.00 stars
– Epic (2014) 4.00 stars
– Contagious (2016) 4.00 stars
Overture
– Overture (1999) 3.50 stars
Overture (IT)
– Overture (2018) NOT RATED
Overworld Dreams
– Voyage (2018) NOT RATED
Ovrfwrd
– Beyond the Visible Light (2014) NOT RATED
Oxygen
– Final Warning (2011) 4.50 stars
Although this one release from 2012 was issued under the band name Oxygen, the group released additional albums (one each in 1994 and 2011, then four albums from 2013 through 2016) under the name Niva. Why? Who knows.
Ozone
– Self Defence (2015) 4.00 stars
Ozone Mama
– The Starship Has Landed (2010) 4.00 stars
– Sonic Glory (2015) 4.00 stars
– Cosmos Calling (2018) NOT RATED
Ozone Quartet
– Fresh Blood (1998) NOT RATED
– Nocturne (1999) NOT RATED
Ozric Tentacles
– Erpsongs (1985) 3.00 stars
– Tantric Obstacles (1985) NOT RATED
– There Is Nothing (1986) NOT RATED
– Sliding Gliding Worlds (1988) NOT RATED
– The Bits Between the Bits (1989) NOT RATED
– Pungent Effulgent (1989) NOT RATED
– Erpland (1990) NOT RATED
– Strangeitude (1991) NOT RATED
– Jurassic Shift (1993) 4.00 stars
– Arborescence (1994) 4.00 stars
– Become the Other (1995) NOT RATED
– Curious Corn (1997) NOT RATED
– Waterfall Cities (1999) NOT RATED
– Swirly Termination (2000) NOT RATED
– The Hidden Step (2000) NOT RATED
– Spirals in Hyperspace (2004) NOT RATED
– The Floor’s Too Far Away (2006) NOT RATED
– The YumYum Tree (2009) 4.00 stars
– Paper Monkeys (2011) NOT RATED
Ozzy Osbourne
– Blizzard of Ozz (1980) 4.00 stars
– Diary of a Madman (1981) 4.50 stars
– Speak of the Devil (1982) 4.00 stars
– Bark at the Moon (1983) 3.00 stars
– The Ultimate Sin (1986) 3.00 stars
– No Rest for the Wicked (1988) 4.50 stars
– No More Tears (1991) 3.50 stars
– Ozzmosis (1995) 3.00 stars
Zap Niles 