Bobby O  (US)  REVIEW
	Outside the Inside  (2005)

O-Head  (UK)  REVIEW
	Visitor  (2012)

Ô Paon  (Québec)  REVIEW
	Fleuve  (2015)

OK Go  (US)  REVIEW
	Of The Blue Colour of the Sky  (2010)

ONO  (US)  REVIEW
	Diegesis  (2014)

The OO-Ray  (US)  REVIEW
	From Street Level: Live at the Big Busk, 7-28-12  (2012)

Oak  (Netherlands)  REVIEW
	Building Steam  (2004)

Oakley  (Germany)  REVIEW
	Peculiar Autumn  (1978)

Jackie Oates  (UK)  REVIEW
	The Violet Hour  (2008)

Pascal Obispo  (France)  REVIEW
	Un Jour Comme Aujourd'hui  (1994)

Obrero  (Sweden)  REVIEW
	Mortui Vivos Docent  (2011)

Senator O'Brien  (US)  REVIEW
	Primary  (2002)

Obscured By Clouds  (US)  REVIEW
	Bleed  (1999)

Frank Ocean  (US)
	Blond  (2016)

Ocean Colour Scene  (UK)  REVIEW
	Painting  (2013)

Odissea  (Italy, progressive)  REVIEW
	Odissea  (1973)

Erin O'Donnell  (US, CCM)  REVIEW
	No Place So Far  (2001)

Aoife O'Donovan  (US)  REVIEW
	Fossils  (2013)

Odyssey  (US)  REVIEW
	Live at Levittown Memorial Auditorium 1974  (2005)

The Odysseys  (Canada)  REVIEWS
	The Odysseys  (2006) Voyagers  (2009)

Odyssice  (Netherlands, neo-progressive)  REVIEW
	Impression  (2000)

of Montreal  (US)  REVIEWS
	Sunlandic Twins  (2005) Skeletal Lamping  (2008)

Ogre  (US)  REVIEW
	Seven Hells  (2006)

Ohama  (Canada)  REVIEW
	Thick as a Brick: The Synth Edition  (2012)

Christine Ohlman & Rebel Montez  (US)  REVIEW
	The Deep End  (2009)

Oiseaux-Tempête  (France)  REVIEW
	ÜTOPIYA?  (2015)

Okkervil River  (US)  REVIEWS
	The Stage Names  (2007) In the Rainbow Rain  (2018)

Ryo Okumoto  (Japan, progressive)  REVIEW
	Coming Through  (2002)

Old 97's  (US, Americana)  REVIEWS
	Too Far to Care  (1997) Blame it on Gravity  (2008)

Olesen-Olesen  (Denmark)  REVIEW
	Der er Brev Fra Onkel Bob i Amerika  (2000)

Jen Olive  (US)
	Warm Robot  (2010) The Breaks  (2013)

Rick Oliver  (UK)  REVIEW
	Continual Battle of Thoughts  (2006)

Michael Olivieri  (US)  REVIEW
	Goodbye Rain  (2009)

Chris Olley  (UK)  REVIEW
	A Streetcar Named Disaster  (2009)

Allan Olsen  (Denmark)  REVIEW
	Gæst  (2004)

Mark Olson  (US)  REVIEW
	The Salvation Blues  (2007)

Ome  (US)  REVIEW
	Tired Birds  (2010)

Omega Syndicate  (UK, electronic)  REVIEWS
	Analogue Waves  (2004) Escape Velocity  (2004) Phonosphere  (2005) Sequences, Chords & Leeds  (2005) Apocalypse  (2006) Horsemen on the Horizon: Live @ Awakenings, 8th July 2006  (2006) Same Synths... Different Day!  (2006) Baptism of Wire  (2007) X  (2011) The Holy & the Ivories  (2011)

Ominous Seapods  (US)  REVIEW
	The Super Man Curse  (2000)

Josh One  (US)  REVIEW
	Narrow Path  (2004)

One Small Step for Landmines  (US)  REVIEW
	One Small Step for Landmines  (2007)

One Starving Day  (Italy)  REVIEW
	Atlas Coelestis  (2009)

One Ton  (Québec)  REVIEW
	Abnormal Pleasures  (2002)

Marykate O'Neil  (US)  REVIEW
	1-800 Bankrupt  (2006)

Only Children  (US, Americana)  REVIEW
	Change of Living  (2004)

Opeth  (Sweden, progressive metal)  REVIEWS
	Deliverance  (2002) Damnation  (2003) Ghost Reveries  (2005) Watershed  (2008) Burden  (2008 EP) Pale Communion  (2014) Sorceress  (2016)

Oranger  (US, powerpop)  REVIEWS
	Doorway to Norway  (1999) The Quietvibrationland  (2000) Shutdown the Sun  (2003)

Orchestra Noir  (UK)  REVIEW
	What if...  (2010)

Orchestral Manoeuvres in the Dark  (UK, synth pop)  REVIEWS
	The Avenue  (1984 b-side) Junk Culture  (1984) (The Angels Keep Turning) the Wheels of the Universe  (1984 single) History of Modern  (2010)

Martin Orford  (UK, neo-progressive)  REVIEW
	The Old Road  (2008)

Ornah-Mental  (Germany)  REVIEW
	Heliopolis  (2009)

Orne  (Finland)  REVIEW
	The Tree of Life  (2011)

Ornithos  (Italy)  REVIEW
	La Trasfigurazione  (2012)

Pat Ortman  (US)  REVIEW
	Pat Ortman  (2001)

Osada Vida  (Poland, progressive metal)  REVIEWS
	Three Seats Behind a Triangle  (2006) The Body Parts Party  (2008) Uninvited Dreams  (2009) Particles  (2013)

Osanna  (Italy, progressive)  REVIEWS
	Taka Boom  (2001) Osanna & David Jackson - Prog Family  (2009) Rosso Rock Live in Japan  (2012)  (2009) Palepolitana  (2015)  (2009) Pape Satàn Aleppe  (2016)  (2009)

Osiris Club  (UK, progressive)  REVIEWS
	Blazing World  (2014) The Wine-Dark Sea  (2018) Blazing Worlds - Live at Roadburn & Twicefold of Kind  (2020)

Kurt Ostbahn & die Kombo  (Austria)  REVIEW
	Ohjo  (2001)

John Oszajca  (US)  REVIEW
	From There to Here  (2000)

Otep  (US)  REVIEW
	The Ascension  (2007)

Other Lives  (US)  REVIEW
	Other Lives  (2009)

Ottoman  (US)  REVIEW
	Times Like These  (2001)

Our Broken Garden  (Denmark)  REVIEWS
	When Your Blackening Shows  (2008) Golden Sea  (2010)

Our Friend the Atom  (US)  REVIEWS
	Our Friend the Atom  (2003) A Fury in Your Words  (2006)

Outer Limits  (Japan, progressive)  REVIEW
	Stromatolite  (2007)

Outer Space  (US)  REVIEW
	Outer Space II  (2012)

Patrick Ovenden  (UK)
	Returning With the Tide  (2013)

Jessica Owen  (Canada)  REVIEW
	Ever-So-Slightly Rearranged  (2003)

Ginny Owens  (US)  REVIEWS
	Long Way Home  (2005) Get in, I'm Driving  (2011)

Owl Watches  (US)  REVIEWS
	Tales From The Inflatable Forest  (2002) Ghost of a Train  (2006) Guaranteed to Be 100% Free of Hit Singles  (2007) The Complete Radio Free Antarctica Tapes  (2010)