- O
- OO
- OO
- OO
- OOaf
- OAFOaK
- OakOBE
- ObeObn
- OBO
- Oce
- OceOCS
- OCTOct
- OctOdd
- OddODE
- ODEOdo
- OdoOf
- OfOff
- OFFOfi
- OfiOgr
- OgrOh
- OhOHN
- OhnOiz
- OJOKA
- OkaOkm
- OKOOla
- OlaOld
- OldOld
- OldOle
- OleOli
- OliOli
- OLIOls
- OlsOma
- OmaOma
- Omaomg
- omgOmo
- OmoO
- OnaOne
- OneOne
- OneOne
- ONE
- OneOnl
- OnlONT
- ontOom
- OomOpe
- OpeOph
- OphOpt
- OpuOra
- OraOrb
- OrbOrc
- OrcOrc
- OrcOre
- OreOri
- OriOri
- OriOrk
- OrkOro
- OroOrq
- OrqOrs
- OrsOru
- OruOsb
- OsbOsc
- OscOSM
- OsmOst
- OstOte
- oteOtr
- OtrOtt
- OttOui
- OuiOus
- OusOut
- OutOut
- OutOut
- OutOve
- OveOVE
- OveOwe
- oweOwn
- OwnOxy
- Oxy
- OZZ
- ozzozz
- 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; Anderson, June, Weikl, Bernd, Creech, Philip, Chicago Symphony Chorus, Chicago Symphony Orchestra, Levine, James
- Orff, Carl; Berliner Philharmoniker, Shinyukai Choir, Ozawa, Seiji
- Orff, Carl; Blegen, Judith, Riegel, Kenneth, Binder, Peter, Cleveland Orchestra Chorus, The, Cleveland Orchestra Children’s Chorus, Page, Robert, Cleveland Orchestra, The, Tilson Thomas, Michael
- Orff, Carl; Hartmann, Gerda, Brünner, Richard, Knoll, Rudolf, Mozarteum Chor Salzburg and Mozarteum Orchester Salzburg, Prestel, Kurt
- 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)
- Organismen & Large, DJ
- Organismen & Large, DJ
- Organiz' (French R'n'B duo)
- Organización X
- Organización, La
- Organization, The (90s US funk metal band)
- Organized Family (Zambian music duo)
- Organized Konfusion (US alternative hip hop duo from Queens, NYC)
- Organized Noize (Atlanta hip-hop production group)
- Organizing Committee, The
- Organizm
- Orgasmo (Bolivian Funk Rock Band)
- ORGAVSM
- Orgel Sound J‐pop
- Orgel, Matthew
- Orgg
- Orgi-E (Danish Rapper)
- Orgi-E feat. Jooks
- Orgi-E feat. Marwan
- Orgi-E feat. Winther, Bjarke
- Orgi-E feat. Xander
- Orgil
- Orgnn
- Orgnners, The
- Orgonášová, Ľuba, Slovenského rozhlasu, Symfonický orchester, Humburg, Will
- Orgone (US funk band)
- Orgone feat. de León, Adryon
- Orgone feat. Franklin, Fanny
- Orgonite (Rave band based in israel)
- Orgullo Nativo
- Orgy (US rock band)
- Orhan, Mahmut
- Orhan, Mahmut & Şener, Sena
- Orhan, Sevcan
- Orhon, Cüneyd
- Orhon, Ozan
- Orhon, Özdal (Turkish Art Music performer)
- Ori (folktronica singer songwriter Ori Alboher)
- Ori, Viktor
- Oria
- Oria (Progressive Groove Metal, Thessaloniki, Central Macedonia)
