- O
- OO
- OO
- OOak
- OakOb
- ObeObo
- OBOOce
- OceOch
- OchOct
- Odd
- OddODM
- ODOOf
- OfOff
- OFFOgr
- OgrOh
- OhOIR
- OirOKA
- OkaOku
- OkuOla
- OlaOld
- OldOli
- OliOli
- OliOls
- OlsOMA
- OmaOme
- OmeOmo
- OMPOnd
- One
- OneOne
- OneOni
- OniOno
- OnoOom
- OomOpe
- OpeOpp
- OppOra
- OraOrb
- OrbOrc
- OrcOrg
- OrgOri
- OriOrk
- OrkOrp
- OrpOrr
- OrrOrv
- OrvOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOue
- OugOut
- OutOut
- OutOut
- OutOve
- OveOVR
- ovrOwl
- OwlOxx
- OxyOZR
- ozz
- 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 Blood (acid doom band from California)
- Old Breakout (blues rock)
- Old Canes
- Old Cat's Drama
- Old Cecil (UK prog folk/rock group)
- 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 (feat. Little Big Town)
- Old Dominion & Moroney, Megan
- Old Fire
- Old Firm Casuals, The
- Old Flame (United States Rock Band feat. Jonny Craig)
- Old Funeral
- Old Gods of Asgard
- Old Gods of Asgard feat. Wake, Alan & Mr. Door
- Old Gray
- Old Heavy Hands
- Old Horn Tooth
- 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 Paths, The
- Old Romantic Killer Band, The (NEW EP and gigs - see press release)
- Old Salt Union
- Old School (Bangladeshi band)
- Old School Freight Train
- Old School Players
- Old Sea Brigade
- Old Sepultura
- Old Settlers
- Old Silver Key
- Old Skin
- Old Smokey
- Old Soul Rebel
- Old Stove
- Old Time Radio
- Old Time Relijun
- Old Town School of Folk Music
- Old Town Trio
- Old Wave
- Old Wharf (Metalcore/Beatdown band from Wolverhampton, UK.)
- Old Wharf ft Hounslow, Daniel
- Old Wounds (New Jersey hardcore band)
- Old, Jase
- Oldarra
- Oldblood (Blackened Doom/Post from UK)
- OLDCODEX
- Olde Throne
- Oldelaf
- Oldelaf et Monsieur D.
- Olden, Lise
