- O
- OO
- OO
- OO
- OOak
- OakOat
- OatObi
- ObiObs
- ObsOce
- OceOce
- OceOct
- OctOdd
- OddOde
- OdeODM
- OdmOer
- OerOff
- OffOff
- OffOGR
- 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
- OslOsT
- ote
- OteOtr
- OtrOtt
- OttOur
- OurOut
- OutOut
- OutOut
- OutOve
- OVEove
- oveOvs
- OVSOwi
- OWIOxl
- Oxl
- OzcOzu
- Ozuozz
- Östen med Resten
- Oster Lapwass
- Oster Lapwass feat. Eddy
- OSTER project
- Ostermann, Willi
- Ostermann, Willi & Orchester
- österreich
- Ostertag, Florian
- Osterwald, Bibi (actress)
- Osterwald, Hazy (Swiss musician, singer and bandleader)
- Osterwald, Hazy, Sextett
- Ostiaputa (Real band name is without space)
- Ostiaputa
- Ostinato (Jazzband)
- Ostkreutz
- Ostkurve, DJ
- OSTON
- OSTON & Audiotree
- OSTON & JORDY
- OSTON & Lauren Sanderson
- ostooandell
- Ostoura, Hamo El
- Ostrar, Adam
- Ostras, Os
- Ostrich Bouquet
- Ostrich Head
- Ostrogoth (Belgian metal band)
- Ostrowska, Małgorzata
- Ostura (Lebanese heavy/power metal)
- Ostyn (Project of Bert Ostyn)
- Ostzonensuppenwürfelmachenkrebs
- Osukaru (Melodic Rock | AOR | Progressive Rock)
- Osunlade
- Osunlade & James, Maiya
- Osunlade feat. Divine Essence
- Osunlade feat. James, Maiya
- Osunlade feat. Oveous Maximus
- Osvajači (Serbian hard rock/heavy metal band)
- Osvaldo (Los Angeles based beatmaker & producer)
- Osvaldo Ayala
- Osvaldorio
- Oswald (German medieval and renaissance group)
- Oswald (a trio, project of Andrea Rottin)
- Oswald (Zouk Singer)
- Oswald, Marianne
- Oswaldir & Carlos Magrão
- Oswalt, Patton
- Oszajca, John
- Oszibarack
- OT (Belgian pop singer Olivia Trappeniers)
- OT the Real
- OT7 Quanny
- Otaam
- Otai, Mounir
- Ōtaki, Yūko (singer)
- Otala (Post-rock quartet from Nottingham, UK)
- Otani, Kow (Japanese anime, film & video game composer)
- Ōtani, Tomoya
- Ōtani, Tomoya feat. Kirk-Holmes, Merry
- Ōtani, Tomoya feat. NateWantsToBattle
- Otargos
- Otarion
- Otava Yo
- otay:onii
- OtC
- OTE
- OTE feat. Ellis, Steven
- Otecko (Slovak MC (H16))
- Otecko feat. Cigo & Igor
- Otecko feat. Smack
- Otecko feat. Spirit, Majk
- Otem Rellik
- Otenki
- Otep
- Otero, Adrián
- Otero, David (00s Spanish musician)
- Otero, David & Adelén
- Otero, David & Basarte, Bely
- Otero, David & Carlos Sadness
- Otero, David & Cepeda
- Otero, David & Fernández, Dani
- Otero, David & Guerra, Ana
- Otero, David & Mäbu
- Otero, David & Soto, Marta
- Otero, David & Taburete
- Otero, David feat. Torres, Iván
- Otero, David, Nil Moliner & Arnau Griso
- Otero, Manolo
- otetsu
- otetsu feat. GUMI
