- O
- OO
- OO
- OO
- OOAF
- OAFOak
- OakObe
- ObeObo
- OboOca
- OcaOce
- OceOct
- OctOct
- Octodd
- OddODE
- ODEOdo
- OdrOf
- OfOff
- OFFOfi
- OFKOgr
- OgrOh
- OhOhn
- OhnOJ
- OJOKA
- OkaOko
- OkoOla
- OlaOld
- Oldold
- OldOle
- OleOli
- OliOli
- OliOls
- OlsOMA
- OmaOMB
- OMBOmi
- OmiOMP
- OmpOnc
- OncOne
- OneOne
- Oneone
- oneONG
- OngOnl
- OnlOnu
- OnuOon
- OonOpe
- OpeOph
- OphOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOre
- OreOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOry
- oryOsb
- OsbOsh
- OshOsm
- OsmOST
- OSTOth
- OthOts
- OtsOtt
- OttOur
- OurOut
- OutOut
- OutOut
- OutOv
- OvOve
- OveOvi
- OviOwe
- OweOx
- OXOYM
- Oyo
- ozz
- OSTON & Audiotree
- OSTON & JORDY
- OSTON & Sanderson, Lauren
- ostooandell
- Ostoura, Hamo El
- Ostrar, Adam
- Ostras, Os
- Ostrich Bouquet
- Ostrich Head
- Östro 430
- Ostrogoth (Belgian metal band)
- Ostrowska, Małgorzata
- Ostura (Lebanese heavy/power metal)
- Ostyn (project of Bert Ostyn)
- 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 & Revelle
- 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)
- Otaku (Ren Avel)
- 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
- Ōtani, Tomoya feat. Quinn, Kellin
- 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
- Otey, Lisa
- OTF Boonie Moe
- OTF Boonie Moe, Rob49 & Only the Family
- Otgoo
- OTH
- Otha (Othalie Husøy)
- Othalan (Polish Folk Metal)
- Othello (Théo Celino)
- Other Colors, The
- Other Ego
- Other End, The (Norwegian duo)
- Other Favorites, The
- Other Guys, The (Scottish A Cappella Group)
- Other Half, The (’60s San Francisco psychedelic rock band)
