O-4
- Opposite Sounds
- Optical 2
- Optik Army
- Optikhelden
- Optimale Härte
- Optimo
- Optimus
- Opus Aeterna
- Opus Dai
- Opuz
- Oques Grasses
- OR
- OR (O-ERRA)
- Ora Maté
- Oracle
- Oracle Sisters
- Oral Bee
- Oran 'Juice' Jones
- Oran Byrne
- Orange And Lemon
- Orange Black
- Orange Grove
- Orange Skyline
- Oranus Lassus
- Oré
- Orba Squara
- Orbit Culture
- Orchestraccia
- Orchestral - The Party Has Just Begun
- Orchestral Manoeuvres In The Dark
- Orchestral Manoeuvres In The Dark (OMD)
- Orchestre Alan Record
- Orchestre Lamoureux
- Orchid
- Orchid Ablaze
- Ordarada
- Ordeal (The)
- Ordeal By Fire
- Orden Ogan
- Order Of Chaos
- Order Of Ennead
- Order Of Era
- Order Of Israfel (The)
- Order Of The Ebon Hand
- Order Of The Fly (The)
- Ordinary Boys (The)
- Ordinary Chill
- Ordinary World
- OrelSan
- Oren Lavie
- Oren Waters
- Orenda Fink
- Oreslan
- Organ (The)
- Organiz
- Organized Konfusion
- Organized Noize
- Orgasmic & Fuzati
- Orgasmus & Schwartz
- Orgânico
- Orgi69 & Bass Sultan Hengzt
- Orgie 69
- Orginal Naabtal Duo
- Orgone
- Orgy
- orhan
- orhan ölmez
- Orhan Gencebay
- Orhan Gencebay & Sibel Can
- Orhan Hakalmaz
- Orhan Rexhepi
- Ori Shochat
- Oriana
- Oriana Leotta
- Orianthi
- Orielles (The)
- Oriente
- Orietta Berti
- Origami - Larila Song
- Origami Horses
- Origami Pigeon
- Origene
- Original 4 Tiroler Buam
- Original 7ven
- Original Alpenland Quintett
- Original Animals (The)
- Original Banda El Limón
- Original Broadway Cast of Dear Evan Hansen
- Original Cast Vienna
- Original Elias
- Original Flavor
- Original God
- Original H
- Original Kiss
- Original Maintaler
- Original Nielsen Brothers
- Original Sicilian Style
- Original Sistaz
- Originoo Gunn Clappaz
- Oriiginelle
- Orikasa Ai
- Orinda Huta
- Oriol Saltor
- Orioles
- Orion Patrol
- Orion Riders
- Orion Sun
- Orion Too
- Orisha Sound
- Orishas
- Orishas + HeatherHeadley
- Orishas - feat. Heather Headley
- ORβIT
- Orjan Nilsen
- Orkesta Mendoza
- Orla Fallon
- Orla Gartland
- Orlando Brown
- Orlando Dixon
- Orlando Johnson
- Orlando Jordan
- Orlando Riva Sound
- Orlando Vera Cruz
- Orlando Weeks
- Orlane
- Orler
- Orlo
- Orlons (The)
- Orly Chap
- OrMany
- Ormigas
- Ornamentality
- Ornella De Santis
- Ornella Felicetti
- Ornella Tempesta
- Ornella Vanoni
- Ornella Vanoni con Bungaro e Pacifico
- Ornella Zocco
- Ornette
- Oro Bianco
- Oro Ferreira
- Orochi
- Orochi & Dallass
- Orpair
- Orphan, The Poet (The)
- Orpheé
- Orplid
- Orquesta Aché
- Orquesta la Dicupe
- Orquesta La Solución
- Orquesta Mayimbe
- Orquesta Zodiac
- Orquestra e Coro Cid
- Orrin Tucker
- Orry Jackson
- Orsai
- Orslok
- Orson
- Ortal
- Orthanc
- Ortiga
- Ortopilot
- Orus
- Orville Peck
- Orwells (The)
- Oryane Wilson
- orzon
- OS
- Os Arrais
- Os Atuais
- Os Barões Da Pisadinha
- OS BARÕES DA PISADINHA
- 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
- OSABA
- Osaka La Band
- Osaka Popstar
- OSBS
- OSC2X
- Oscar
- Oscar #Worldpeace
- Oscar & The Wolf
- Oscar And The Wolf
- Oscar Anton
- Oscar Athie
- Oscar Benton
- Oscar Brand
- Oscar Casañas
- Oscar Cortez
- Oscar Cruz
- Oscar D' León
- Oscar D'Leon & Joe Arroyo
- Oscar DeLaughter
- Oscar Emch
- Oscar Enestad
- Oscar G. & Ralph Falcon - Dark Beat
- Oscar Giammarinaro
- Oscar Hammerstein II
- Oscar Hoyos!
- Oscar Jerome
- Oscar Joost
- Oscar Lang
- Oscar Martinez
- Oscar Mas
- Oscar Maydon
- Oscar Peterson
- Oscar Repo
- Oscar Scheller
- Oscar Solis Y Su Banda Magistral
- Oscar Thiffault
- Oscar Welsh
- Oscar Zia
- Oscarcito
- Oschino
- Oscillatör
- Oscu
- Osdorp Posse
- Osez Josephine
- Oshea
- Oshi
- Oshiego
- OSHUN
- Osi And The Jupiter
- Osiah
- Osibisa
- Osira
- Osirus Jack
- OSKA
- Oskar i Slavica Cukteras
- Oskar Linnros
- Osker
- Oslo Ibrahim
- Oslo Swan
- Osman Hadzic
- Osman Hadzic feat. Sabrina
- osman hadzici
- Osman Yüksek
- Osmani Garcia
- Osmar Escobar
- Osmar Milito, Luna e Suza
- Osmo Ikonen
- Osmonds
