O-4
- Orjan Nilsen
- Orla Fallon
- Orla Gartland
- Orlando Brown
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- Orlando Johnson
- Orlando Jordan
- Orlando Riva Sound
- Orlando Vera Cruz
- Orlane
- Orler
- Orlo
- Orlons (The)
- Orly Chap
- Ormigas
- Ornamentality
- Ornella De Santis
- Ornella Felicetti
- Ornella Tempesta
- Ornella Vanoni
- Ornella Vanoni con Bungaro e Pacifico
- Ornette
- Oro Ferreira
- Orochi & Dallass
- Orpair
- Orphan, The Poet (The)
- Orpheé
- Orplid
- Orquesta la Dicupe
- Orquesta Mayimbe
- Orquesta Zodiac
- Orquestra e Coro Cid
- Orrin Tucker
- Orry Jackson
- Orson
- Ortal
- Orthanc
- Ortopilot
- Orus
- Orville Peck
- Orwells (The)
- Oryane Wilson
- orzon
- OS
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- Os Atuais
- Os Colonos Zo Scarpon
- Os Incríveis
- Os Monarcas
- Os Originais do Samba
- Os Paralamas Do Sucesso
- Os Pedrero
- Os Resentidos
- Os Seminovos
- Os Serranos
- Os Travessos
- Osaka Popstar
- OSBS
- OSC2X
- Oscar
- Oscar #Worldpeace
- Oscar & The Wolf
- Oscar And The Wolf
- Oscar Athie
- Oscar Benton
- Oscar Brand
- Oscar Casañas
- Oscar Cortez
- Oscar Cruz
- Oscar D' León
- Oscar D'Leon & Joe Arroyo
- Oscar Enestad
- Oscar G. & Ralph Falcon - Dark Beat
- Oscar Giammarinaro
- Oscar Hammerstein II
- Oscar Hoyos!
- Oscar Joost
- Oscar Martinez
- Oscar Mas
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- Oscar Solis Y Su Banda Magistral
- Oscar Thiffault
- Oscar Zia
- Oscarcito
- Oschino
- Oscillatör
- Oscu
- Osdorp Posse
- Osez Josephine
- Oshea
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- OSHUN
- Osibisa
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- Osirus Jack
- Oskar i Slavica Cukteras
- Oskar Linnros
- Osker
- Oslo Swan
- Osman Hadzic
- Osman Hadzic feat. Sabrina
- osman hadzici
- Osman Yüksek
- Osmani Garcia
- Osmar Escobar
- Osmar Milito, Luna e Suza
- Osmo Ikonen
- Osmonds
- Osmose
- Oso Oso
- Ossessione
- Ossian
- Ost & Kjex
- OST Pokemon 3
- Ost+Front
- Ostbahn Kurti
- Ostblockschlampen
- Ostbrut
- Oster Lapwass
- Ostfront
- Ostkreuz
- OSTR
- Osunlade
- Osvajaci
- Osvaldo Di Dio
- Osvaldo Pugliese
- Osvaldo Supino
- Oswald Sattler
- Oswaldo Delgado
- Oswaldo Montenegro
- Oswin Benjamin
- Osx Mob
- Oszibarack
- Otargos
- Otenki
- OTEO
- Otep
- Othello
- Othelloman
- Other People's Heartache & Bastille
- Other Tribe (The)
- Other Two
- Otherkin
- Others (The)
- OtherView
- Otherwise
- Othorized F.A.M.
- Otierre
- Otis Ball
- Otis Clay
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- Otis Reed
- Otis Stacks
- Oto Nemsadze
- Otray
- Otsuka Ai
- Otsuki Maki
- Ott Lepland
- Ottavia Bruno
- Ottavio De Stefano
- Ottavo Padiglione
- Otti Albietz
- Otto Knows
- Otto Nezbeda
- Otto Normal
- Otto Ohm
- Otto Orlandi
- Otto Reutter
- Otto Waalkes
- Ottodix
- Ottoman Empire Soundsystem
- Ottowan
- Otzeki
- Ou Est Le Swimming Pool
- Ou2s
- Ouarda
- Ouf Le Prof
- Ougenweide
- Ought
- Ouiam El Mrieh
- Ouija Macc
- Ouimoshi
- Oum
- Oumar
- Our Blood
- Our Boy Drew & The Hustle Standard
- Our Brother The Native
- Our City Skyline
- Our False Heroes
- Our Game
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- Our Hollow, Our Home
- Our Innocence Lost
- Our Lady Peace
- Our Last Night
- Our Lives In Motion
- Our Mexican Butcher
- Our Mirage
- Our Native Daughters
- Our New Celebrity
- Our Past Days
- Our Reflections
- OurAfter
- Ouran High School Host Club
- Ourfa
- Ouri
- Ours
- Out Blazing Generation
- Out Like Pluto
- Out Lines
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- Out Of Eden
- Out of Frame
- Out Of Order
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- Outasight
- Outbreakband
- Outburst
- Outcast Youth
- Outerspace
- Outfit (The)
- Outhere Brothers
- Outkast
- Outlandish
- Outlast
- Outlaw
- OUTLAW AVE
- Outlaws
- Outlawz
- Outlet
- Outline (The)
- Outline In Color
- Outlines
- Outlook
- Outloud
- Outrage
- Outrageus
- outRAGEus!
- Outro Lugar
- OutroEu
- Outshyne
- Outsidaz
- Outside Agency (The)
- Outside Duo
- outsideOUTSIDE
- Outsiders Joy
