- O
- OO
- OO
- OOak
- OakOb
- ObeOBO
- ObrOce
- OceOch
- Och
- OctODE
- OdeODO
- odoOf
- OfOff
- OffOgr
- OgrOh
- OhaOis
- OisOka
- OkaOku
- OkuOlc
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOma
- OmaOme
- OMFOn
- OnOne
- OneOne
- ONEOne
- oneOnk
- OnkOnT
- OntOor
- OorOpe
- OpeOpu
- OpuOra
- OraOrc
- OrcOrd
- OrdOrh
- OrhOri
- OriOrl
- OrlOrq
- OrqOrt
- OrtOsa
- OsaOsc
- OscOsm
- Osn
- Otr
- OtrOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxi
- OxiOze
- ozz
- Oranger
- Oranges (post-hardcore/math rock band)
- Oranges & Lemons
- Oranges Band, The
- Orangestar
- Orangestar feat. IA
- Orangez
- Orango
- Oranj Symphonette
- Oranssi Pazuzu (Finnish black metal)
- Orantes, Francisco (Christian music singer-songwriter)
- Orantes, Francisco feat. Orantes, Azucena
- Orantes, Marilú (Christian music artist)
- Oranžās Brīvdienas
- Oratnitza
- Oratorio
- Oratorio The World God Only Knows
- Oratory
- Orax (Italian)
- Orazbayeva, Aisha (Kazakh violinist)
- ORB (Australian prog rock)
- Orb (Lithuanian stoner)
- Orb, The
- Orb, The & Perry, Lee “Scratch”
- Orb, The feat. Perry, Lee “Scratch”
- Orba Squara
- Orbach, Jerry
- Orbach, Jerry, Lansbury, Angela and Chorus
- Orbakaitė, Kristina
- Orbans, The
- Orbison, Joy
- Orbison, Joy & Boddika
- Orbison, Joy w/ Sen, Léa
- Orbison, Joy, Overmono & Kwengface
- Orbison, Roy
- Orbison, Roy & Burgess, Sonny
- Orbison, Roy & Harris, Emmylou
- Orbison, Roy & Lang, K.D.
- Orbison, Roy & Melson, Joe
- Orbison, Roy & Teen Kings, The
- Orbison, Roy and Teen Kings, The
- Orbison, Roy feat. Cash, Johnny, Lewis, Jerry Lee & Perkins, Carl
- Orbison, Roy feat. Harris, Emmylou
- Orbison, Roy feat. Lang, K.D.
- Orbison, Roy with Cash, Johnny, Lewis, Jerry Lee and Perkins, Carl
- Orbit (Boston‐based rock band)
- orbit (German indie pop)
- Orbit Culture (melodic death metal/groove metal)
- Orbit Service
- Orbit, William (English musician, composer and record producer)
- Orbit, William feat. Orton, Beth
- Orbit, William feat. Scattergood, Polly
- Orbita Wiru (Polish rock group)
- Orbital (UK techno group)
- Orbital (atmospheric black metal band from Canada)
- Orbital & Badalamenti, Angelo
- Orbital & Hammett, Kirk
- Orbital & Lady Leshurr
- Orbital & Sleaford Mods
- Orbital Alignment (Progressive Death Metal from Nottingham, UK)
- Orbital feat. Gray, David
- Orbital feat. Hammett, Kirk
- Orbital feat. Hawking, Stephen
- Orbital feat. Lady Leshurr
- Orbital feat. Little Pest, The
- Orbital feat. Mediæval Bæbes
- Orbital feat. Mediæval Bæbes
- Orbital Junction (UK rock band)
- orbital voices
- Orbital, Sleaford Mods
- Orbiter (Stephen Walking & 7 Minutes Dead)
- Orbiting Human Circus
- ORBS
- Orbweavers, The (Melbourne Band)
- Orc (progressive metal band from Lansing, MI, USA)
- Orca (UK early 1990’s breakbeat production duo)
- Orca (Psychedelic trance artist)
- Orca (portuguese group)
- Orca Eroticae
- Orcas
- Orchards (band from Brighton, UK)
- Orchards (Des Moines)
- Orchester der Deutschen Oper Berlin, Jochum, Eugen
- Orchester der Vereinigten Bühnen Wien
- Orchester der Wiener Volksoper, Kantschieder, Paul
- Orchester Etienne Cap
- Orchester Gino Mariano
- Orchester Reto Parolari
- Orchester Werner Tauber
- Orchestra
