- O
- OO
- OO
- OO
- OOaf
- OAFOaK
- OakObe
- ObeOBO
- Obo
- OcaOce
- OceOCT
- OctOct
- OctOdd
- oddODE
- ODEOdo
- OdoOf
- OfOFF
- OffOfi
- OfiOgr
- OgrOh
- OhOhn
- OhnOJ
- OJOka
- OKAOko
- OkoOla
- OlaOld
- OldOld
- OldOle
- OleOli
- OliOli
- OliOls
- OlsOma
- OmaOmb
- OMBOMI
- OMIOmo
- OmoOnc
- OncOne
- OneONE
- OneONE
- OneONF
- OnFOnl
- OnlOnu
- OnuOom
- OomOpe
- OpeOph
- OphOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrc
- OrdOre
- OreOri
- OriOri
- OriOrl
- Orl
- OroOrq
- OrqOrs
- ORTOrw
- OrwOsb
- OsbOse
- OseOsm
- OsmOst
- OstOth
- OthOtr
- OTROtt
- OttOum
- OumOut
- OUTOut
- OutOut
- OutOuv
- OUWOVE
- OveOvi
- OviOwe
- OweOwu
- OwuOya
- OyaOzi
- oziozz
- 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)
- Oriach, Riccie (Tropical artist from the dominican republic)
- Oriain, Charlie
- Oriakhi, Davina
- Orialus
- Oriana (Argentine model, actress and singer)
- Oriana Nash (American singer-songwriter, Oriana Isabel Nash)
