- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeOBL
- OblObs
- Obsoce
- OceOce
- oceOct
- OctOda
- OdbOdd
- OddOde
- OdeODU
- ODUOf
- OfOff
- OFFOfi
- Ofiogo
- OGROh
- OhOhi
- OhiOIL
- OilOk
- OkOke
- OkeOl
- OlOla
- OlaOld
- OldOl
- OlOlg
- OlgOli
- OliOli
- OliOls
- OlsOMA
- OmaOma
- OmaOme
- OmeOmn
- OmnOn
- OnOne
- ONEOne
- OneOne
- OneOne
- OneONJ
- OnkOnn
- ONOOny
- OnyOos
- OosOpe
- OpOpi
- OpiOpu
- OpuOra
- Oraorb
- OrbOrc
- OrcOrc
- OrcOre
- OreOrh
- OrhOri
- ORIOrk
- OrkOrn
- OrnOrq
- OrqOrr
- OrrOrt
- OrtOsa
- OsaOsc
- OscOsk
- OskOss
- OssOT
- OtaOth
- OthOtt
- OttOtt
- OttOur
- OurOut
- OutOut
- OutOut
- OutOv
- OvOve
- OveOve
- OveOwe
- OweOwl
- OwlOxl
- Oxl
- OzaOzo
- OzoOzz
- Old Man Wizard
- Old Man's Will
- Old Man’s Child
- Old McBezen & Dungaree Dan
- Old Merry Tale Jazzband
- Old Mervs
- Old Moonshine Band
- Old Neon
- Old Night
- Old Ox
- Old Paths, The (U.S. Southern Gospel)
- Old Reliable String Band
- Old Rock City Orchestra
- Old Romantic Killer Band, The
- Old Salt (Belgian Americana band)
- Old Salt Union
- Old School (Bangladeshi band)
- Old School Freight Train
- Old School Players
- Old School Tie
- Old Sea Brigade
- Old Sea Brigade feat. Sital‐Singh, Luke
- Old Season
- Old Sepultura
- Old Settlers
- Old Silver Key
- Old Skin (Manchester, UK hardcore)
- Old Smokey
- Old Solar
- Old Soul (American hardcore/screamo band)
- Old Soul (Montreal rock band)
- Old Soul Rebel
- Old Stove
- Old Swan Band, The
- Old Time Relijun
- Old Town School of Folk Music
- Old Town Trio
- Old Wave
- Old Wharf (Metalcore/Beatdown band from Wolverhampton, UK.)
- Old Wharf & Bound in Fear
- Old Wharf ft Hounslow, Daniel
- Old Wounds (New Jersey hardcore band)
- Old, Jase
- OLDCODEX
- Olde (Canada, Metal)
- Olde Growth
- Olde Pine
- Olde Throne
- Olde, DJ
- Oldeaf
- Oldelaf
- Oldelaf et Monsieur D.
- Older Sun
- Older, Paul
- Oldest Sea
- Oldfield, Mike (English musician, songwriter and producer)
- Oldfield, Mike feat. Chapman, Roger
- Oldfield, Mike feat. Westenra, Hayley
- Oldfield, Sally
- Oldfield, Sally feat. Oldfield, Mike
- Oldfield, Terry
- Oldfield, Terry & Garo, Carlos
- Oldfield, Terry & Saraswati, Soraya
- Oldfield, Wendy
- Oldham Tinkers, The
- Oldham, Andrew, Orchestra, The
- Oldham, Ned
- Oldham, Spooner
- Oldham, Will
- Oldhead
- Oldians, The (ska jazz band from Barcelona, Spain)
- Olding, Max (Australian pianist)
- Oldods
- OldPee (French rapper, 13 Block)
- Olds, Jerome
- Oldschool Rednex
- Oldsoul
- oldstar
- OLDTONES, The
- Oldu O Zaman
- Ole 60
- Ole Alfsen
- Ole Erling
- Ole I’Dole
- Ole Ivars
- Ole Ivars med Danielsson, Kikki
- Olé Olé
- Olé Olé con Diges, Daniel
- Olé Olé con Modestia Aparte
- Olé Olé con Norte, El, Segura, Santiago, Modestia Aparte, Antonio Albella y Pingüino en mi ascensor, Un
