- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OblOBS
- ObtOce
- OceOch
- ochOct
- OctOdd
- OddOde
- OdeOdi
- OdiOdy
- OdyOfe
- OfeOff
- OffOga
- OGBOh
- OhOha
- OhaOi
- OiOjo
- OjoOka
- okaOku
- OkuOla
- OlaOld
- OldOld
- OleOle
- OleOli
- OliOLI
- OliOls
- Olsom
- OmOma
- OmaOme
- OmeOmn
- OmnOn
- ONOne
- OneOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOOc
- OodOpa
- OpaOpe
- OpeOpp
- OppOr
- OrOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrf
- OrfOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOrx
- OryOsb
- OsbOse
- OseOsm
- OsmOst
- OSTOte
- OteOto
- OtoOtt
- OttOua
- OuaOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOVX
- OvyOwe
- OweOxi
- OxiOza
- OzaOzo
- OzoOZZ
- Olamide & Popcaan
- Olamide & Wizkid
- Olamide feat. Buckwyla
- Olamide feat. FAVE
- Olamide feat. Kida Kudz
- Olamide feat. Minus2
- Olamide feat. Phyno
- Olamide feat. Savage, Tiwa
- Olamide, Dre, Dr. & Spinall
- Olamide, Vibez, Seyi & Muyeez
- Olamide, Vibez, Seyi, Asake, Jonn, Young feat. Daecolm
- Olamide, Wizkid & Darkoo
- OLAN (electronic/alternative singer‐songwriter, producer, multi‐instrumentalist)
- Olan, Ray y su Sasón
- Olander, Jeremy
- Olaniran, Tunde
- Olaniran, Tunde feat. Invincible
- Olărașu, Dinu
- Olare Utseoritsenere Prosper
- Olari, Silvia
- OLAS
- OLAS & Renārs Zeltiņš
- OLAS feat. Mazais Zaļais & Upelnieks, Pēteris
- OLAS feat. Renārs Zeltiņš
- Olas, Las
- Olasoji, Wale
- Olathia (Heavy metal band from Cleveland, Ohio)
- Olatuja, Alicia
- Olatuja, Michael (UK electric and acoustic bassist/composer, based in New York)
- Olatunji (alias for Olatunji Yearwood. Trinidadian soca artist.)
- Olatunji, Babatunde
- Olavo Lüpia
- Olay, Ruth
- Olazermi (French rapper)
- OLBRY
- Olcay, Zuhal
- Olcay, Zuhal & Onural, Cengiz
- Old (grindcore / industrial metal band, aka O.L.D.)
- Old (German black/thrash metal)
- Old & In the Gray
- Old & In the Way
- Old 97’s
- Old 97’s & Jennings, Waylon
- Old Abram Brown
- Old Accusers
- Old Again
- Old Apparatus
- Old Bear Mountain
- Old Best Friend
- Old Blind Dogs
- Old Blood (acid doom band from California)
- Old Breakout (blues rock)
- Old Caltone
- Old Canes
- Old Cat's Drama
- Old Cecil (UK prog folk/rock group)
- Old Ceremony, The
- Old City (Justin Mayer and MC/lyricist Tr38cho)
- Old Coke
- Old Corpse Road (UK / symphonic black metal with folk influences)
- Old Crow Medicine Show
- Old Crow Medicine Show feat. Ferrell, Sierra
- Old Crow Medicine Show feat. Staples, Mavis
- Old Crow Medicine Show feat. Watson, Willie
- Old Daisy
- Old Dead Tree, The
- Old Dogs
- Old Dominion (Hungarian black metal band)
- Old Dominion (US country band)
- Old Dominion (feat. Little Big Town)
- Old Dominion & Moroney, Megan
- Old Dominion feat. Knight, Gladys
- Old Dominion feat. Little Big Town
- Old Dominion with Moroney, Megan
- Old Fire
- Old Firm Casuals, The
- Old Flame (United States rock band feat. Jonny Craig)
- Old Funeral
- Old Glory & The Black Riviera
- Old Gods of Asgard
- Old Gods of Asgard feat. Wake, Alan & Mr. Door
- Old Gray
- Old Growth
- Old Growth (Woodland Black Metal)
- Old Heavy Hands
- Old Horn Tooth
- Old Jim & Scarlett
- Old Jim, LUNAX & Kickbait
- Old Kerry McKee
- Old Loaves (New Zealand post rock/metal)
