- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OblObs
- OBSOce
- OceOch
- OchOct
- OctOdd
- OddOde
- OdeOdi
- OdiOdy
- OdyOfe
- OfeOff
- OffOga
- OgaOh
- OhOha
- OhaOi
- OiOjo
- OjoOka
- OkaOku
- OkuOla
- OlaOld
- Oldold
- OldOle
- OleOli
- OliOli
- OLIOls
- OlsOM
- omOma
- OmaOme
- OmeOmn
- OmnOn
- OnOne
- OneOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOob
- OOcOP
- OpaOpe
- OpeOpp
- OppOr
- OrOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrf
- OrfOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOrx
- OryOsb
- OsbOse
- OseOsm
- OsmOst
- OSTOte
- OteOto
- OtoOtt
- OttOu
- OuaOUR
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOvt
- OvvOwe
- OweOxh
- OxiOza
- OzaOzo
- OzoOZZ
- Originale, Ragz feat. Glacier, John
- Originale, Ragz feat. Knucks
- Originale, Ragz feat. LOLA
- Originale, Ragz feat. Sampha
- Originale, Ragz feat. Tiana Major9 & Venna
- Originales de San Juan, Los
- Originální pražský synkopický orchestr
- Originals
- Originals (Progressive psychedelic trance duo project from Israel)
- Originals, The (Motown group)
- Originals, The (Brazilian group)
- Originoo Gunn Clappaz
- Origo (Epidemic Sound)
- Orihusay
- Orikasa, Ai
- Orikasa, Fumiko
- Orina (Punk-rock band from Málaga, Spain)
- Orinegro Tropical (Salsa)
- Orinoko
- ORIO (hololive vtuber duo)
- Orioles, The
- Orion (goa trance artist Jean Borelli)
- Orion (Symphonic Prog Group from France)
- Orion (Cybernetic Noir)
- Orion (Techno producer Juska Wendland)
- ORION 224
- Orion 8
- Orion and the Melted Crayons
- Orion Experience, The
- Orion Riders
- Orion Rigel Dommisse
- Orion Sun
- Orion the Hunter
- Orion Too (Belgian 2000s trance project)
- Orion Too feat. Caitlin
- Orión XL (Argentine Rapper)
- orion, artemis & mayari.
- Orion, DJ (Electro/Cumbia)
- Orion, Eli
- Orion, Hailey
- Orion's Beethoven
- Orion’s Reign
- Orion’s Reign feat. Minniva
- Orionix
- Orions Belte (Norwegian instrumental band)
- Orions Belte feat. Aase, Sigrid
- Orions Belte feat. Lerche, Sondre
- Orisaka, Yūta
- Orisha
- Orishas (Cuban hip hop group)
- Orishas feat. Buenaventura, Yuri
- Orishas feat. Passi
- Orisma
- Orito, Shinji
- Orizzon (Modern Metal Band)
- Orjan (trance producer)
- Orka (Band from Faroe Islands)
- Orkan (Swedish prog rock)
- Orkest
- Orkest Zonder Naam
- Orkesta Mendoza (Indie Mambo)
- Orkestar Business Class (Finnish band)
- Orkesterpop
- OrKestra (incl. Ex-Members of ELO)
- Orkhan Efendi
- ORKID (Swedish singer)
- Orkidea (Finnish DJ / producer Tapio Hakanen)
- Orkiestra Dni Naszych
- Orkiestra św. Mikołaja (The Saint Nicholas Orchestra)
- Orkiestra Symfoniczna Filharmonii Narodowej, Rowicki, Witold
- Orkiestra Uliczna Z Chmielnej
- Orko (UK rock band)
- Orko the Sycotik Alien
- Orkrist
- Orlandi, Violet
- Orlandi, Violet & Skar
- Orlandi, Violet feat. Dan Vasc
- Orlandi, Violet feat. First to Eleven & Halocene
- Orlandi, Violet feat. Young, Jonathan
- Orlandi, Violet, Babic, Lauren, Halocene & First to Eleven
- Orlando (English Romo band)
- Orlando (Belgian tech house singer)
- Orlando (Dutch band by singer-songwriter Tessa Douwstra)
- Orlando (Italian Italodance project from S.A.I.F.A.M. Group)
- Orlando (UK singer songwriter)
- Orlando Julius (Nigerian saxophonist, singer, bandleader, and songwriter)
- Orlando Marin & His Orchestra
- Orlando Philharmonic Orchestra
- Orlando Pops Orchestra
- Orlando Pops Orchestra & Lane, Andrew
