| 1 | O'Jays, The (1/1) [Soundtrack]
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| 2 | Oakenfold, Paul (1/14) [Trance]
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| 3 | Oasis (23/151) [BritPop, other, Pop, Rock, other]
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| 5 | Obie Trice (1/1) [Soundtrack]
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| 6 | Obsidian Gate (1/7) [Black Metal]
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| 7 | Obtained Enslavement (1/8) [other]
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| 8 | Occult (1/11) [Death Metal]
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| 9 | Ocean Colour Scene (3/48) [Rock]
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| 10 | October Tide (2/15) [Metal]
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| 11 | Odal (1/2) [Black Metal]
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| 12 | Odes Of Ecstasy (3/21) [Metal]
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| 13 | Odyssey (1/2) [Drum & Bass]
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| 14 | Officium Triste (1/3) [Metal]
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| 15 | OGB & Intouchable (1/1) [Soundtrack]
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| 16 | OK Go (1/13) [Rock]
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| 17 | Okuda Atsuya (1/6) [Folk]
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| 18 | Old Dirty Bastard And Black Ke (1/1) [Soundtrack]
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| 19 | Oleander (1/1) [Soundtrack]
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| 20 | Olemus (1/9) [Metal]
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| 21 | Oliver Shanti & Friends (1/14) [New Age]
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| 22 | Olivia Ruiz (1/13) [Chanson]
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| 23 | Olmeca (1/11) [Latin]
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| 24 | Omara Portuondo (1/11) [Folk]
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| 25 | Omarion (1/1) [Soundtrack]
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| 26 | Ominous (1/10) [Death Metal]
|
| 27 | OMNE DATUM OPTIMUM (1/1) [Ambient]
|
| 28 | Omni Trio (3/29) [Drum & Bass, Pop]
|
| 29 | Omni3 (3/83) [Hip-Hop]
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| 30 | On Thorns I Lay (4/37) [Metal]
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| 31 | One Shot (1/13) [Soundtrack]
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| 32 | Onedice (1/9) [Heavy Metal]
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| 33 | Onslaught (1/9) [Metal]
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| 34 | Oomph! (2/22) [Industrial]
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| 35 | Opera IX (4/26) [Black Metal, Death Metal]
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| 36 | Opeth (3/21) [Death Metal]
|
| 37 | Orbital (3/16) [Soundtrack]
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| 38 | Order From Chaos (1/13) [other]
|
| 39 | Organic Audio (1/1) [Soundtrack]
|
| 40 | Organized Cartel (1/19) [Rap]
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| 41 | Origination (1/2) [Drum & Bass]
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| 42 | Originoo Gunn Clappaz (1/15) []
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| 43 | Orishas Feat. Heather Headley (1/1) [Soundtrack]
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| 44 | Orkrist (2/26) [other]
|
| 45 | Ornella Vanoni (1/1) [Soundtrack]
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| 46 | Ornette Coleman (1/11) []
|
| 47 | Orphaned Land (3/27) [Heavy Metal, Metal]
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| 48 | Otis Redding (1/2) [Soundtrack]
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| 49 | Ouija (1/8) [other]
|
| 50 | Our Lady Peace (1/1) [Soundtrack]
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| 51 | Outcast (1/1) [Soundtrack]
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| 52 | Outrage (1/8) [Metal]
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| 53 | Outworld (1/10) []
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| 54 | Overseer (6/18) [Soundtrack]
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| 55 | Owl City (4/38) [Indie]
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| 56 | Oxide & Neutrino (1/1) [Soundtrack]
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| 57 | Oxiplegatz (2/10) [other]
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| 58 | Oxmo Puccino (2/2) [Soundtrack]
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| 59 | Oxnkiller (1/12) [Death Metal]
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| 60 | Ozzy Osbourne (8/64) [Hard Rock, other]
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