| Artist | | O Terco | | O'Connor, Mark | | O'Hearn, Patrick | | O'List, Davy | | O-U | | O.R.k. | | OAK | | Oaksenham | | Oberon | | Obiymy Daschu | | Oblivion Sun | | Obsidian Dreams | | Obsidian Kingdom | | Ocean | | Ocean Mole | | Oceans 5 | | Oceans of Night | | Oceansize | | Octafish | | Octarine Sky | | October | | October Equus | | October Project | | October Tree | | Octopus | | Octopus Diver | | Octopus Garden | | Octopus Syndicate | | Odd Circus | | Odd Dogs | | Odd Logic | | Odd Todd | | ODDGOD | | Oddjob | | Oddleaf | | Oddtomatic | | Odessa | | Odin's Court | | Odissea | | Odrareg | | Odysseys, The | | Odyssice | | Of Petra | | Of Sound Mind | | Offenbach | | Offramp | | Ogives | | Ogrodowicz, Bartosz | | Oh. | | Ohm | | Ohmphrey | | Oiapok | | OJKOS | | Oktober | | Okumoto, Ryo | | Old Man & The Sea, The | | Old Rock City Orchestra | | Oldfield, Mike | | Oldfield, Sally | | Ole Lukkoye | | Olive Mess | | Olsen, Borge | | Olympic | | OmbraLuce | | Omega | | Omie Wise | | Omni | | On The Raw | | Once Upon A Winter | | One Shot | | Oneida | | Oneira | | Onevoice | | Oniric | | Onirico | | Onoffon | | Ontalva, Angel | | Ontofield | | Onza | | OPA | | Operation Midnight Climax | | Opeth | | Opium Cartel, The | | Opram | | Optimum Wave | | Opus 5 | | Opus Avantra | | Opus Symbiosis | | Opusculus | | Orange Clocks | | Orb, The | | Orbit, William | | Orchestre Celesti | | Orchestre Sympathique | | Ordinary Brainwash | | Oregon | | Oresund Space Collective | | Orexis | | Orford, Martin | | Organic Noises | | Orion | | Orme, Le | | Orne | | Ornicar | | Ornithos | | Orphan Project | | Orphaned Land | | Orpheus Nine | | Orrenmaa Band | | Orvalians, The | | OryZhein | | Osada Vida | | Osamu | | Osanna | | Osanna con Gianni Leone | | OSI | | Osibisa | | Osiris | | Osiris The Rebirth | | Oskay/O'Domhnaill | | Osmosis | | Ospovat, Sam | | Ossi Maristo | | Ossicles | | Osta Lcve | | Ostinati | | Ostrich Society | | Osv | | Othello Syndrome, The | | Other Side, The | | Ottla | | Ouellet, Yvan | | Our Solar System | | Out Of Focus | | Out of the Beardspace | | Outer Limits | | Outlaws Of Ravenhurst | | Outopsya | | Outre Mesure | | Outside | | Outside In | | Oval Planet | | Ovals, The | | Ovary Lodge | | Over A Thousand Miles | | Overground Collective | | Overhead | | Overture | | Overworld Dreams | | Ovni | | OVRFWRD | | Ovum | | Owane | | Owen, Judith | | OWKMJ(Ore Wa Konna Mon Ja Nai) | | Oxhole | | Oxhuitza | | Oxomoco | | Oxymoron | | Oysterhead | | Oz Noy | | Öz Ürügülü | | Ozone Player | | Ozone Quartet | | Ozric Tentacles |
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= Song added within the past days