- O
- OO
- OO
- OO
- OOak
- OakOat
- OatObi
- ObiObs
- ObsOce
- OceOce
- OceOct
- OctOdd
- OddOde
- OdeODM
- OdmOer
- OerOff
- OffOff
- Offogo
- OGROh
- OhOhm
- OHMOja
- OjaOka
- OkaOkt
- OktOla
- OLAOld
- OldOle
- OleOli
- OliOli
- OliOll
- OllOLU
- OluOm
- OmOme
- OmeOmo
- OMOOna
- OOne
- OneOne
- OneOne
- oneOne
- ONFOnl
- Onl
- Oon
- OonOpe
- OpeOpi
- OpiOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrm
- OrmOrp
- OrpOrr
- OrrOrt
- OrtOsb
- OsbOsc
- OscOsl
- Osl
- OstOte
- OTFOtr
- OTROtt
- OttOur
- ourOut
- OutOut
- OutOut
- OutOVE
- OVEove
- OveOVS
- OvtOWI
- OwiOxl
- OxlOzc
- OzcOzu
- Ozuozz
- Ordo Equilibrio
- Ordo Equitum Solis
- Ordo M’era Luna
- Ordo Rosarius Equilibrio
- Ordo Rosarius Equilibrio feat. Spiritual Front
- Ordog (doom metal band from Finland)
- Ordoñez, Josete
- Ordonówna, Hanka
- Ordorika, Ruper
- Ordos (Swedish stoner/metal)
- Ordre du Chaos, L' (Projet musical franco-allemand mêlant folk-rock médiéval et metal moderne lent et syncopé.)
- Oré (French hip-hop/chanson/neo soul rapper/vocalist)
- Oreada
- Orealis
- Oreazon
- Orebolo (Norwalk, CT indie band)
- Orecus (Melodic Death Metal/Groove Metal from Sweden)
- oreglo (Jazz fusion, jazz-funk, london jazz, reggae, London)
- Oregon
- Oregon Bike Trails
- Oreia (Brazilian rapper)
- Oreia, Hot e (Brazilian Rap Duo)
- Oreiro, Natalia
- Oreja (UK producer/DJ Paul Dolby aka Seiji)
- Oreja de Van Gogh, La
- Oreka TX (Basque band)
- Orelha, MC
- Orellana Lucca
- Orellana, Raúl (DJ & producer)
- Orellana, Raúl feat. Brown, Jocelyn
- Orellana, Roberto
- Orelle (Italian artist Elisabetta Pasquale)
- Orelsan (French rapper)
- Orelsan & Gringe
- Orelsan & Toxic Avenger, The
- Orelsan feat. Cordae
- Orelsan feat. Damso
- Orelsan feat. FIFTY FIFTY
- Orelsan feat. GIMS
- Orelsan feat. GIMS
- Orelsan feat. Gringe
- Orelsan feat. Ibeyi
- Orelsan feat. Ikuta, Lilas
- Orelsan feat. Nekfeu & Rascal, Dizzee
- Orelsan feat. Neptunes, The
- Orelsan feat. Skread
- Orelsan feat. Stromae
- Orelsan feat. Thal, Ron “Bumblefoot”
- Orelsan feat. Yamê
- Orelsan with Bangalter, Thomas
- Oremuz
- Oren, Foreign
- Oren, Peter
- Orenstein, Janet
- Orenstein, Norman
- Oreo Moon (Finnish band)
- ORESAMA
- ORESKABAND
- Oreste & His Queensland Orchestra
- Orestea (UK band)
- Oresteia
- Orestes (Indonesian metal band)
- Oreya
- Orfeo (Eddy de Clercq, Otto van den Toorn)
- Orfeó Català
- Orff, Carl (composer)
- Orff, Carl; Berliner Philharmoniker, Shinyukai Choir, Ozawa, Seiji
- Orfield, Carson
- Orford, Martin
- Organ (Finnish synth pop group)
- Organ Beats, The
- Organ Donor (Richmond, VA Death Metal Band)
- Organ Donor (early 2000s rock band)
- Organ Donors (hard dance group)
- Organ Freeman (US)
- Organ Tapes
- Organ, Samuel
- Organ, Samuel feat. Dazey
- Organ, The
- Organ, Tyne-James
- Organ, Tyne-James & Gordi
- Organ, Willy (Belgian weirdo synthpop artist Simon Platteau)
- Organectomy (New Zealand brutal death metal)
- Organek, Tomek
- Organic Audio
- Organica
- Orgânico, Mirele & Froid
- Organised Scum
- Organism, The
- Organismen (Swedish rapper)
