- 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
- Orme, Le
- Ormiston
- Ormonde
- ORMUS (Spanish DJ)
- ormus (Trance/Progressive producer)
- Orna
- Ornament (Afghan Whigs and Marcy Mays)
- Ornamento y Delito
- Ornaments (Italian band)
- Ornate
- Ornate feat. Jack the Underdog
- Ornatos Violeta
- Orne
- Ornelas, Raúl
- Ornella Napolitani
- Ornella Thiry
- Ornery (Folk punk band from Vancouver, BC, Canada)
- Ornette (French‐Italian singer‐songwriter multi‐instrumentalist)
- Ornithology (Performance name of Shaan Chhadva)
- Ornob
- ORO (Uruguay)
- Oro Negro (Grupo de Ecuador)
- Oro Sólido
- Oro Swimming Hour
- Orobians, The
- Orochen (Post-rock / folk from Sweden)
- Orochi (Brazilian rapper)
- Orodruin (Traditional Doom Metal band from U.S.A.)
- Orofino, Richard
- Orok, Shayne
- Orok, Shayne & Orok, Ali
- Öröm
- Oropesa, Omar (Christian music singer)
- Ôros Kaù (Belgian black metal)
- Orouni
- Oroza, Bobby
- Oroza, Bobby & El Michels Affair
- Oroza, Bobby feat. Cold Diamond & Mink
- Orozco Barrientos
- Orozco, Alejandra
- Orozco, Antonio (Spanish singer-songwriter)
- Orozco, Antonio & Fonsi, Luis
- Orozco, Antonio & Juanes
- Orozco, Antonio & KAROL G
- Orozco, Antonio & Martín, Dani
- Orozco, Antonio & Pereyra, Luciano
- Orozco, Antonio & Raphael
- Orozco, Antonio & Soledad
- Orozco, Antonio & Yatra, Sebastián
- Orozco, Antonio feat. Fonsi, Luis
- Orozco, Antonio feat. Malú
- Orozco, José-Luis
- Orozco, Rafael (pianist)
- Orozco, Regina
- Orozco, Verónica
- Orphan (80's band from Winnipeg, Canada)
- Orphan (deathcore band)
- Orphan Boy
- Orphan Hate
- Orphan Newsboys, The
- Orphan Prodigy
- Orphan Project
- Orphan Songs
- Orphan Swords (Belgian duo)
- Orphan Zero
- Orphanage
- Orphaned Bee, The
- Orphaned Land
- Orphaned Land & Amaseffer
- Orphaned Land feat. Hackett, Steve
- Orphaned Land feat. Koray, Erkin
- Orphaned Land feat. Kürsch, Hansi
- Orphaned Land feat. Lindberg, Tomas
- Orphaned Land feat. Poliker, Yehuda
- Orphans, The (West Chester, PA (USA) punk band)
- Orphans, The (Australian power pop)
- orphantwin
- Orpharion
- Orphax (Dutch ambient / drone musician)
- Orphean Passage
- Orphei Drängar
- Orphei Drängar, Sund, Robert
- Orphei Drängar, Sund, Robert, Persson, Olle, Alin, Folke
- Orpheus (Australian death metal band)
- Orpheus (1960s–70s Boston rock band)
- Orpheus (masquerade drag artist)
- Orpheus Boys Choir (on 1974 Schonberg BBC cd & 1996 Christmas cd)
- Orpheus Chamber Orchestra (US orchestra)
- Orpheus Ensemble, The
- Orpheus Nine
