- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOCE
- OceOct
- octOdd
- OddOdi
- OdiOf
- OfOff
- OffOh
- ohohG
- OhgOji
- OJMokh
- OKIOla
- OlOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnOnb
- OncOne
- OneOne
- OneOni
- ONJont
- OntOos
- OotOph
- OphOR
- OrOrb
- OrbOrc
- OrcORE
- OreOri
- OriOrl
- OrlOrp
- OrpOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOvi
- OviOwl
- OwlOye
- Ozy
- OzzOZZ
- Oláh Gergő
- Oláh, Ibolya
- Olaisen, Ylva (Norwegian pop artist)
- Olaisen, Ylva & Brenner, Stig
- Olaiya, Victor (Nigerian trumpeter)
- Olakira (Adefemi Ebenezer, Nigerian producer)
- Olam Ein Sof ("Olam Ein Sof" translates to "World of the Infinites")
- Olamide (Nigerian Hip Hop artist)
- Olamide feat. Phyno
- OLAN (electronic/alternative singer‐songwriter, producer, multi‐instrumentalist)
- Olan, Ray y su Sasón
- Olander, Jeremy
- Olaniran, Tunde
- Olare Utseoritsenere Prosper
- Olari, Silvia
- Olasoji, Wale
- Olathia (Heavy metal band from Cleveland, Ohio)
- Olatuja, Michael (UK electric and acoustic bassist/composer, based in New York)
- Olatunji (alias for Olatunji Yearwood. Trinidadian soca artist.)
- Olatunji, Babatunde
- Olay, Ruth
- Olcay, Zuhal
- Olcay, Zuhal & Onural, Cengiz
- Old (grindcore / industrial metal band, aka O.L.D.)
- Old
- Old & In the Gray
- Old & In the Way
- Old 97’s
- Old 97’s & Jennings, Waylon
- Old Abram Brown
- Old Again
- Old Bear Mountain
- Old Blind Dogs
- Old Breakout (blues rock)
- Old Canes
- Old Cat's Drama
- Old Ceremony, The
- 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 & Moroney, Megan
- Old Fire
- Old Firm Casuals, The
- Old Funeral
- Old Gods of Asgard
- Old Gods of Asgard feat. Wake, Alan & Mr. Door
- Old Gray
- Old Heavy Hands
- Old Loaves (New Zealand post rock/metal)
- Old Man Canyon
- Old Man Gloom
- Old Man Lizard
- Old Man Luedecke
- Old Man Markley
- Old Man River
- Old Man Saxon
- Old Man Wizard
- Old Man’s Child
- Old McBezen & Dungaree Dan
- Old Merry Tale Jazzband
- Old Mervs
- Old Neon
- Old One
- Old Ox
- Old Romantic Killer Band, The (NEW EP and gigs - see press release)
- Old Salt Union
- Old School Freight Train
- Old Sea Brigade
- Old Sepultura
- Old Settlers
- Old Silver Key
- Old Smokey
- Old Soul Rebel
- Old Stove
- Old Time Radio
- Old Time Relijun
- Old Town School of Folk Music
- Old Wave
- Old Wharf (Metalcore/Beatdown band from Wolverhampton, UK.)
- Old Wharf ft Hounslow, Daniel
- Old Wounds (New Jersey hardcore band)
- Old, Jase