- O
- OO
- OO
- OO
- OOak
- OakOat
- OatObi
- ObiObs
- ObsOce
- OceOce
- OceOct
- OctOdd
- ODDOde
- OdeODO
- odoOes
- OesOff
- OffOff
- OffOgr
- OGROh
- OhOHN
- OHNOjb
- OjeOKA
- OKAokt
- OktOLA
- OlaOld
- OldOle
- OleOli
- OliOli
- OliOlm
- OlmOlv
- OlvOma
- OmaOme
- OmeOmo
- OmoOna
- ONBOne
- OneOne
- Oneone
- oneONG
- OngOnl
- OnlOnu
- OnuoOo
- Ope
- OpeOpi
- OpiOpu
- OpvOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- Oriorm
- OrnOrp
- OrqOrr
- OrrOrt
- OrtOsb
- OsbOsc
- OscOsm
- OsmOst
- OstOTH
- OthOtr
- OtsOtt
- OttOur
- OurOut
- OutOut
- OutOut
- OutOve
- Oveove
- OveOVX
- OvyOwl
- OwlOxl
- OxlOzc
- OzcOzu
- Ozuozz
- Otto Normal
- Otto Ohm
- Otto, James
- Otto, James feat. Milsap, Ronnie
- Otto, Molly
- Otto, Natalino
- Otto's Daughter
- Ottobre (Italian singer/songwriter)
- Ottobrenero (Italian progressive metal)
- Ottolien (brother duo from Hanover)
- Ottolini, Mauro
- Ottolini, Mauro e la sua Orchestra Ottovolante
- Ottolini, Mauro, Sousaphonix
- Ottolini, Robyn
- Ottoman (Icelandic blues rock band)
- OttoMattic
- Ottone Pesante (Italian band)
- ottori (vocaloid producer)
- OTTTO
- Ottum, Josh
- Otu (Finnish audio engineer & musician, Moonic Productions)
- otuka
- OTUS (Italian sludge/doom metal band)
- Ótvar Pestis
- Otway, John
- Otway, John & Barrett, Wild Willy
- Otway, John & Barrett, Wild Willy
- Otyg
- Otyken (Siberian aborigine’s music group)
- Otzeki
- Ötzi (Oakland post-punk)
- Ötzi, DJ (Austrian entertainer and schlager singer)
- Ötzi, DJ & Bellamy Brothers, The
- Ötzi, DJ & Friedle, Lisa‐Marie
- Ötzi, DJ & Gott, Karel
- Ötzi, DJ & HBz
- Ötzi, DJ & Hermes House Band
- Ötzi, DJ & P., Nik
- Ötzi, DJ & P., Nik
- Ötzi, DJ & Pircher, Marc
- Où est le Swimming Pool (English synthpop group)
- Ou2s (french rapper)
- Ouai Stéphane
- Ouaipaul
- Oualid (Dutch rapper/vocalist Oualid Roshdy)
- Oub LCK
- OUBEL
- Oubéret
- Oublaire
- Ouboter, Maaike
- Oud west
- Ouellet, Karim
- Ouellet, Karim feat. Sarahmée
- Ouellet, Yvan
- Ouertani, Abderraouf
- Ougenweide
- Ought (Canadian post-punk band)
- Oui 3
- Oui lele
- oui merci (Montreal indie rock band)
- Ouija (French progressive rock band)
- Ouija Macc
- Ouijabeard (Rock, Hardrock, Metall)
- Ouimette, Steve
- Ouin, DJ
- Ouineta
- Oulahlou
- Oulton, Quinn
- Oum (Oum el Ghaït Benessahraoui)
- Oum Shatt
- Oumar (French rapper Oumar Magassa)
- Oumou Dioubate
- Oumua
- Ounsworth, Alec
- Oupa
- Our 11th Hour (Progressive Rock Group from Syracuse, NY)
- Our Anthem
- Our Broken Garden
- Our Brother the Native
- Our Ceasing Voice
- Our Ceasing Voice & Ryan, Matthew
- Our Common Collapse (Deathcore band from Minnesota)
- Our Daily Bread
- Our Darkest Days
- Our Daughter’s Wedding
- Our Dementia Choir
- our distant worlds
- Our Fears
- Our Final Hour
- Our Future Leaders
