- O
- OO
- OO
- OO
- OO
- oOak
- OakObe
- ObeOBL
- OBLOC
- OCOce
- oceOCn
- OcoOct
- OctOdd
- OddOde
- ODEOdo
- OdoOet
- ofOff
- OffOff
- OffOgl
- OGMOh
- OhOhl
- OhlOis
- Oisok
- OKAOKI
- OKIOl
- OlOld
- OldOld
- OLDOle
- OleOli
- OliOli
- OliOlm
- Olu
- OmaOme
- OmeOmn
- OmnOn
- OnOnd
- OndOne
- OneOne
- OneOne
- ONEOni
- OniOnl
- OnlOny
- OnyOos
- OosOpe
- Opeopi
- OPLoqb
- OQuOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOre
- OreOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOrv
- OrwOsb
- OsbOse
- OseOsm
- OsmOst
- Ote
- oteOtr
- OtrOtt
- Ottoui
- OuiOus
- OusOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOwe
- Oweowl
- OwlOxo
- Oxo
- Ozu
- Ozuozz
- 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 & Voorn, Joris
- Orbital Alignment (Progressive Death Metal from Nottingham, UK)
- Orbital feat. Hammett, Kirk
- Orbital feat. Hawking, Stephen
- Orbital feat. Lady Leshurr
- Orbital feat. Little Pest, The
- Orbital feat. Mediaeval Baebes
- Orbital feat. Mediaeval Baebes
- Orbital Junction (UK rock band)
- Orbital Resonance Dilemma (Chilean rock band)
- orbital voices
- Orbital, Sleaford Mods
- Orbiter (Stephen Walking & 7 Minutes Dead)
- Orbiter (indie rock band from Boston)
- Orbiting Human Circus
- Orbits (Norwegian band featuring members of Jaga Jazzist and Neon Ion)
- Orbits, The (1950s US doo-wop group from Hartford, CT)
- Orbits, The (a.k.a. The Laurels, 50s doo-wop)
- orbitt, Riku Matsushima, Timbre, the Carrier, Dari
- ORBO & The Longshots
- 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 (The Metal Rock Summer Festival)
- Orca Eroticae
- ORCALAND
- OrcaMind
- Orcas
- Orchardist, The (Nashville folk band)
- Orchards (band from Brighton, UK)
- Orchards (Alternative metal band from Dallas, Texas)
- Orchester der Bayreuther Festspiele, Böhm, Karl
- Orchester der Bayreuther Festspiele, Krauss, Clemens
- Orchester der Deutschen Oper Berlin, Jochum, Eugen
- Orchester der Vereinigten Bühnen Wien
- Orchester der Versöhnung, Das
- Orchester der Wiener Volksoper
- Orchester der Wiener Volksoper, Kantschieder, Paul
- Orchester Gino Mariano
- Orchester Reto Parolari
- Orchester Werner Tauber
- Orchestra
- Orchestra (Hot Spot Orchestra)
- Orchestra (For Now), The (art rock/progressive rock group)
- Orchestra Alec Medina
- Orchestra Bagutti
- Orchestra Baobab (Senegalese Afro‐Cuban band)
- Orchestra Capri
- Orchestra Città di Ferrara
- Orchestra del Maggio Musicale Fiorentino, Serafin, Tullio
- Orchestra del Teatro alla Scala di Milano, Giulini, Carlo Maria
- Orchestra del Teatro alla Scala di Milano, Serafin, Tullio
- Orchestra del Teatro Comunale di Bologna, Chailly, Riccardo
- Orchestra del Teatro dell’Opera di Roma
- Orchestra dell’Accademia Nazionale di Santa Cecilia, Chung, Myung-Whun
- Orchestra dell’Accademia Nazionale di Santa Cecilia, Pappano, Antonio
- orchestra di Piazza Vittorio, L’
- Orchestra Fireluche
- Orchestra Fireluche & Riba, Pau
- Orchestra Franco Bagutti
- Orchestra Fuego
- Orchestra Harlow
- Orchestra Harlow & Miranda, Ismael
- Orchestra JB
- Orchestra Marrabenta Star de Moçambique
- Orchestra Marrabenta Star de Moçambique feat. Wazimbo
- Orchestra Morphine
- Orchestra Mozart
- Orchestra of Opera North, Daniel, Paul
- Orchestra of Spheres (New Zealand psychedelic)
- Orchestra of St. Luke’s, Adams, John
- Orchestra of St. Luke’s, De Waart, Edo
- Orchestra of St. Luke’s, Tilson Thomas, Michael
- Orchestra of Syrian Musicians, The
- Orchestra of the Age of Enlightenment
- Orchestra of the Eighteenth Century, Brüggen, Frans
- Orchestra of the Mariinsky Theatre, Gergiev, Valery
- Orchestra of the Mariinsky Theatre, Gergiev, Valery
- Orchestra of the National Music Institute, Seoul (aka. National Classical Music Institute)
- Orchestra of the National Music Institute, Seoul & Kim Ki-Su
