O-4
- 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 Hammerstein II
- Oscar Hoyos!
- Oscar Joost
- Oscar Martinez
- Oscar Peterson
- Oscar Repo
- Oscar Thiffault
- Oscar Zia
- Oscarcito
- Oschino
- Oscillatör
- Osdorp Posse
- Osez Josephine
- Oshea
- Oshi
- Oshiego
- OSHUN
- Osibisa
- Osira
- Oskar i Slavica Cukteras
- Oskar Linnros
- Osker
- Oslo Swan
- Osman Hadzic
- Osman Hadzic feat. Sabrina
- osman hadzici
- Osman Yüksek
- Osmani Garcia
- Osmar Escobar
- Osmo Ikonen
- Osmonds
- Osmose
- 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
- Osx Mob
- Oszibarack
- Otargos
- Otenki
- OTEO
- Otep
- Othello
- Othelloman
- Other People's Heartache & Bastille
- Other Tribe (The)
- Other Two
- Others (The)
- OtherView
- Otherwise
- Othorized F.A.M.
- Otierre
- Otis Ball
- Otis Clay
- Otis Driftwood
- Otis Redding
- Otis Reed
- Otis Stacks
- Oto Nemsadze
- 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
- Oumar
- Our Blood
- Our Boy Drew & The Hustle Standard
- Our Brother The Native
- Our City Skyline
- Our False Heroes
- Our Game
- Our Girl
- 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
- Out of Control
- Out of Doubt
- Out Of Eden
- Out of Frame
- Out Of Order
- Out Of Reverie
- 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
- OV7 & Kabah
- Ove Stoylen
- Over Atlantic
- Over It
- Over Kill
- Over Sands
- Overcoats
- OverDoz
- Overflow
- Overground
- Overgrown
- Overload Generation
- Overlorde
- Overly Attached Girlfriend
- Overmars
- OverMaster
- Overmood
- Overnight Classic
- Overnite
- Overprivileged (The)
- Overstreet
- Overtake
- Overthrow
- Overture Black
- OverUnder (The)
- Overwerk
- Ovidi Montllor
- Ovidiu Anton
- Ovila Légaré
- Ovlov
- Owais
- OWEL
- Owen Benjamin
- Owen Campbell
- Owen Danoff
- Owen Ovadoz
- Owen Temple
- Owl
- Owl City
- Owl John
- Owl Paws
- Owlle
- Owls
- Owls By Nature
- OWS
- Oxana
- Oxford Collapse
- Oxford Drama
- Oxi
- Oxia
- Oxide & Neutrino
- Oxmo Puccino
- Oxmo Puccino feat. K-reen
- Oxo 86
- Oxygen
- Oxygene
- Oxymoron
- OY
- Oyann
- Oystar
- Oyster Prairie
- Oysterband (The)
- Oz Noy
- Ozan
- Ozark Henry
- Ozi Noor
