- O
- OO
- OO
- OO
- OO
- oOak
- OakObe
- ObeObl
- OBLOC
- OCOce
- OceOCN
- OCn
- OctOdd
- OddOde
- OdeOdo
- OdoOet
- OetOff
- OffOff
- OffOgl
- OglOh
- OhOhl
- OhlOis
- OisOKA
- OkaOKI
- OkkOl
- OlOld
- OldOLD
- OldOle
- OleOli
- OliOli
- OliOlm
- Olu
- Oma
- OmaOme
- OmeOmn
- OmnOn
- OnOnd
- OndOne
- OneOne
- OneONE
- OneOni
- OniOnm
- OnMOny
- OnyOos
- OosOpe
- OpeOpo
- OpoOqu
- OquOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrf
- OrfOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOS
- OSOsb
- OsbOsh
- OshOsm
- OsmOST
- OSTOth
- OthOtr
- OtrOtt
- OttOum
- OunOUT
- OutOut
- OutOut
- OutOuu
- OuvOve
- OveOvi
- OviOwe
- OweOws
- OwsOxy
- Oxy
- OZZ
- OZZozz
- Ohlin, Ari
- Ohlman, Christine & Montez, Rebel
- Ohm Guru
- Ohm-I (Leron Gray)
- Ohm-N-I
- Ohmama, Takashi
- Öhman Organ Grinders (Kjell Öhman; Ulf Andersson; Claes Janson; Thomas Arensen; Tommy Johnson & Douglas Westlund)
- Öhman, Kjell (Swedish jazz musician)
- Ohmio
- Ohmna
- Ohmori, Motoki
- Ohmori, Yohei
- Ohms, The
- Ohmura, Takayoshi
- OHMYMEITING & Lee, Marcus
- OHMYMEITING & MFMF.
- OHN
- OHNA (Newcastle, Australia)
- OHNO (LA latino rapper)
- Ohno, Aika
- Ohno, Eri
- Ohno, Katsuo
- Ohno, Katsuo & Ohno, Katsuo
- Ohno, Yuji (anime music composer and jazz pianist)
- Ohno, Yuji & Lupintic Five
- Ohno, Yuji & Lupintic Five with Friends
- Ohno, Yuji & You & The Explosion Band
- Ohno, Yuji, Trio
- OhNos, The
- OHO (Trip-Hop/Folk/Electronica)
- OHO
- Oho, The (Finnish band)
- OHora, Zephaniah
- OHR (Seattle based psych solo project of Craig Klein.)
- Ohrage
- Ohrbooten
- Ohrenfeindt
- Ohrima
- Ohta, Mitsuhiro
- Ohtaki, Eiichi
- Ohtani, Tomoya, Eguchi, Takahito feat. Barnitt, Quinn
- Ohtar (Polish black metal)
- Ohtis
- Ohuchi, Yoshiaki
- ohyeahsumi
- OHYUNG
- OHYUNG & STEFA*
- Oi Polloi
- Oi Va Voi (British band)
- Oi Va Voi feat. Zinger, Earl
- Oi-Melz
- Oi-Skall Mates
- Oi! Scouts, The (Oi band from USA)
- Oi! Se Arma (Islas Canarias)
- Oi! The Arrase
- OID (Indie Vocaloid Musician)
- Oídos Fresh, Los
- Oif Simchas
- Oigăn (Eugen Nuțescu)
- Óige
- Õigemeel, Birgit
- OIIO (Dutch indie folk band)
- OIJ (Dutch musician Valentijn Crouwel)
- Oikawa, Mitsuhiro
- Oiki (dubstep artist)
- Oïkoumen (French symphonic metal band)
- Oil (Bolivian Rock Band)
- Oil (Hard Rock band from Lahr in Germany)
- Oil 10
- Oil Barons, The
- Oil Boom
- Oil Giant
- Oil on Canvas (Daggers, Hoffmann)
- Oiling Boiling Rhythm ’n’ Blues Band
- Oilix
- Oimara
- Oimara (aka Benedikt Hafner)
- Oinas, Nuppu feat. Bee, Sara
- Oingo Boingo
- OIO (polish Hip-Hop trio (OKI, Igi, Otsohodzi))
- OiOai (Portuguese pop-rock band)
- OIR A RIO
- Oirabot
- Oiseaux-Tempête
- Oishi, Masayoshi
- Oisín (70/80s Irish Celtic Folk)
- Oisin (Argentinian nu metal band)
- Oister Boy (Minneapolis grunge punk band)
- Oistrakh, David Fiodorovich (violinist)
- Oistrakh, David Fiodorovich, Berliner Philharmoniker
