- O
- OO
- OO
- OOak
- OakObe
- ObeObs
- ObsOce
- OceOct
- OctOdd
- OddODE
- ODEOdu
- ODVOff
- OffOG
- OGOh
- OHOhm
- OhmOjo
- OjoOki
- OkiOla
- OlaOld
- OldOle
- OleOli
- OliOlo
- OloOma
- OmaOme
- OmeON
- ONOne
- OneONE
- ONEOne
- OneOnl
- OnlOnu
- OnwOpa
- OpaOph
- OphOR
- OrOrb
- OrbOrc
- OrcOre
- OreOri
- OriOrk
- OrkOrp
- OrpOrs
- Orsory
- OrzOsc
- OscOsl
- OslOst
- OstOti
- OtiOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxm
- OXOOzo
- OzoOZZ
- Orchestre de l’Opéra national de Paris, Prêtre, Georges
- Orchestre de la Société des Concerts du Conservatoire, Cluytens, André
- Orchestre de la Société des concerts symphoniques de Paris, Leibowitz, René
- Orchestre de la Suisse Romande, Ansermet, Ernest
- Orchestre de la Suisse Romande, Ansermet, Ernest
- Orchestre de Paris, Karajan, Herbert von
- Orchestre Ducoin
- Orchestre International du Vetex (Belgian brassband)
- Orchestre National de Barbès
- Orchestre national du Capitole de Toulouse, Plasson, Michel
- Orchestre national du Capitole de Toulouse, Plasson, Michel
- Orchestre philharmonique de Paris, Cosma, Vladimir
- Orchestre Tout Puissant Marcel Duchamp
- Orchid (United States screamo band)
- Orchid (American doom metal group)
- Orchid (eldia associate)
- Orchid feat. Funk, Simply
- Orchid Mantis
- Orchid Mantis ft. sign crushes motorist
- Orchidelia
- Orchids, The (Sarah Records)
- Orchids, The (Kim Fowley managed group)
- Orcivus
- Orcus (Philadelphia)
- Orcustus (Norwegian black metal)
- Ord, Boris
- Ord, Maren
- ORDEM
- Orden Mundial
- Orden Ogan
- Orden Ogan feat. Frank Beck & Thompson, Ross
- Ordén, Janne
- Order (Norwegian Black Metal)
- Order of Elijah, The (Joplin, MO)
- Order of Ennead
- Order of Israfel, The
- Order of the Ebon Hand (Greece / Black Metal)
- Order of the Fly, The
- Order of Týr
- Order of Voices
- Order, The (Hard 'n' Heavy, Switzerland)
- Order89 (Parisian darkwave trio)
- Ordge, Jimmy Arthur (Canada)
- Ordinaires, The (USA band)
- Ordinance (USA progressive death metal)
- Ordinarius
- Ordinary Boys, The
- Ordinary Elephant
- Ordinary People (New Jersey)
- Ordinary Peoples
- Ordinary Surfers
- Ordinary Time
- Ordo Equitum Solis
- Ordo Rosarius Equilibrio
- Ordo Rosarius Equilibrio feat. Spiritual Front
- Ordog (doom metal band from Finland)
- Ordonówna, Hanka
- Ordorika, Ruper
- Ordos (Swedish stoner/metal)
- Oré (French hip-hop/chanson/neo soul rapper/vocalist)
- Orealis
- Oreazon
- Orebolo (Norwalk, CT indie band)
- Orecus (Melodic Death Metal/Groove Metal from Sweden)
- Oregon
- Oregon Bike Trails
- Oreia (Brazilian rapper)
- Oreia, Hot e
- Oreiro, Natalia
- Oreja (UK producer/DJ Paul Dolby aka Seiji)
- Oreja de Van Gogh, La
- Orellana Lucca
- Orellana, Raúl (DJ & producer)
- Orellana, Raúl feat. Brown, Jocelyn
- Orellana, Roberto
- Orelle (Italian artist Elisabetta Pasquale)
- Orelsan
- Orelsan & Gringe
- Orelsan & Toxic Avenger, The
- Orelsan feat. Cordae
- Orelsan feat. Damso
- Orelsan feat. Gims
- Orelsan feat. Gringe
- Orelsan feat. Ibeyi
- Orelsan feat. Nekfeu & Rascal, Dizzee
- Orelsan feat. Neptunes, The
- Orelsan feat. Skread
- Orelsan feat. Stromae
- Orelsan feat. Thal, Ron “Bumblefoot”
- Oremuz
