- O
- OO
- OO
- OOak
- OakObe
- ObeObr
- OBSOce
- OceOch
- OchOct
- OctOde
- OdeOdo
- OdoOf
- OfOff
- OffOgr
- OgrOha
- Oiz
- OizOka
- OKAOkw
- OkYOld
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOm
- OmOmi
- OmiOn
- OnOne
- OneOne
- OneOne
- OneOnl
- Onlonu
- OnuOos
- OotOpe
- OpeOpu
- OpuOra
- OraOrc
- OrcOre
- OreOri
- OriOri
- ORIOrn
- OrnOrq
- OrqOrt
- OrtOsb
- Osbosh
- OshOSR
- OssOte
- OteOtt
- Ott
- Ous
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwi
- OwiOxm
- OxmOzo
- Ozoozz
- Orchestra Harlow & Miranda, Ismael
- Orchestra JB
- Orchestra Marrabenta Star de Moçambique
- Orchestra Morphine
- Orchestra Mozart
- Orchestra of Syrian Musicians, The
- Orchestra of the Mariinsky Theatre, Gergiev, Valery
- Orchestra of the Royal Opera House, Covent Garden
- Orchestra Rosichino (Grande Orchestra Rosichino)
- Orchestra Spettacolo Casadei
- Orchestra Super Mazembe
- Orchestra, Bert Kaempfert
- Orchestra, Big Time
- Orchestra, Bone Poets
- Orchestra, Chennai
- Orchestra, KIV
- Orchestra, Moka Efti (Music from the 20s)
- Orchestra, Puente, Tito's
- Orchestraccia
- Orchestral Manoeuvres in the Dark
- Orchestre de l’Opéra national de Paris, Prêtre, Georges
- Orchestre de l’Opéra national de Paris, Prêtre, Georges
- Orchestre de la Société des Concerts du Conservatoire, Cluytens, André
- Orchestre de la Société des concerts symphoniques de Paris, Leibowitz, René
- Orchestre de la Suisse Romande, Ansermet, Ernest
- Orchestre de la Suisse Romande, Ansermet, Ernest
- Orchestre de Paris, Karajan, Herbert von
- Orchestre Ducoin
- Orchestre International du Vetex (Belgian brassband)
- Orchestre National de Barbès
- Orchestre national du Capitole de Toulouse, Plasson, Michel
- Orchestre national du Capitole de Toulouse, Plasson, Michel
- Orchestre philharmonique de Paris, Cosma, Vladimir
- Orchestre Tout Puissant Marcel Duchamp
- Orchestre Veve (garage rock band from DR Congo)
- Orchid (United States screamo band)
- Orchid (American doom metal group)
- Orchid (eldia associate)
- Orchid feat. Simply Funk
- Orchid Mantis
- Orchid Mantis ft. sign crushes motorist
- Orchidelia
- Orchids, The (Sarah Records)
- Orchids, The (Kim Fowley managed group)
- Orcivus
- Orcus (Philadelphia)
- Orcustus (Norwegian black metal)
- Ord, Boris
- Ord, Maren
- ORDEM
- Orden Mundial
- Orden Ogan
- Orden Ogan feat. Frank Beck & Thompson, Ross
- Ordén, Janne
- Order (Norwegian Black Metal)
- Order of Elijah, The (Joplin, MO)
- Order of Ennead
- Order of Israfel, The
- Order of the Ebon Hand (Greece / Black Metal)
- Order of the Fallen
- Order of the Fly, The
- Order of Týr
- Order of Voices
- Order, The (Hard 'n' Heavy, Switzerland)
- Order89 (Parisian darkwave trio)
- Ordge, Jimmy Arthur (Canada)
- Ordinaires, The (USA band)
- Ordinance (USA progressive death metal)
- Ordinarius
- Ordinary Boys, The
- Ordinary Elephant
- Ordinary People (New Jersey)
- Ordinary Peoples
- Ordinary Surfers
- Ordinary Time
- Ordo Equitum Solis
- Ordo Rosarius Equilibrio
- Ordo Rosarius Equilibrio feat. Spiritual Front
- Ordog (doom metal band from Finland)
- Ordonówna, Hanka
- Ordorika, Ruper
- Ordos (Swedish stoner/metal)
- Oré (French hip-hop/chanson/neo soul rapper/vocalist)
- Orealis
- Oreazon
- Orebolo (Norwalk, CT indie band)
- Orecus (Melodic Death Metal/Groove Metal from Sweden)
- Oregon
- Oregon Bike Trails
- Oreia (Brazilian rapper)
