Creators
- O'Brien and BurchO'DeathO'foshoOak Steel & LightningOak StreetOak TotemOakhurstOakland RoadOblivious FoolsObsidian's DreamThe Ocean As MistressOcean ExpositionochloThe Octave BelowOctopusOctopus NebulaOculusOcupantherOdd SquadOddball ProtocolOddsFicheOdyssey LabOf A RevolutionOff the DomeOff the GridOff the PointOfferingOffSteadyOh No! CasinoOhio Pie FactoryOkayOlafOld CalifornioOld Dead BugOld Deer EnsembleOld E AllstarsOld GroveOld Man BrownOld Man LuedeckeOld Man Music CollectiveThe Old Pine Road BandOld Salt UnionOld School Freight TrainOld ShoeThe Old Silver BandOld UnionOlde GrowthOlive Mountain BoysOliver ThompsonOliveriaOlivia Tremor ControlOlospoOlympic Sound CollectiveThe Olympic SymphoniumOM Trio
- The Omega MoosOminous SeapodsOminous Seapods Side Projectsomon raOmphalosThe OmsteadersOn The BusOn the OneOn The RocksOn The Spot TrioOnce AgainOne After AnotherOne Big GuitarOne FrequencyOne Hundred HurricanesOne Man GathersOne Of ThemOne ReasonOne Step BeyondOne Step FurtherOne TimeOne Time WeekendOne Ton TablespoonOne UnderOne Way OutOne Way TrafficOne-Eyed JackOne-Rob BandThe OnehittersONEWAYOUTOnion Creek CrawdaddiesOnly WarningOnthebusOobleckOpen Space ProjectOperant Lab BandtOperaticOpheliaOphurOpposite Boxoptimus rhymeOrangadang!The Orange ConstantThe Orange MinuteOrange TelevisionOranjestaOrchard LoungeOrchard ThiefThe OrchardsThe Ordinary WayOreganicOresund Space CollectiveOrgan DonorsOrgan FairchildOrgan Freeman
- Organic Hate MailOrganic ProofThe Organic Sound ProjectOrganically Good TrioOrganik Time MachineOrganomicsOrgoneOrismoOroborosOrooniThe Ort PhenomenonOscillation StationOsheOstad Manoochehr SadeghiOteil and FriendsOteil and the PeacemakersThe Other HalfThe Other OnesThe OthershipOtisOtis And The Elevators (1985-1990)Otis GroveOtto and the getawaysOtto Mobile & The MoanersOtusOuchcubeOuija BrothersOur Grass is BlueOur Lady PeaceOur Neighbor BarryOur Own WorldOursThe Out of TownersOutbackOuter Borough Brass BandOuter StylieOutformationOuthouseOutnumberedThe OutskirtsOutskirts of RealityOutta Body eXperienceOval OpusOver the EdgeOver the RhineOver-ReactorOverserved GentlemenOvert NegritudeOwsley CountyThe Ox and the FuryOxford Whig PartyOxidantOzomatli