- O
- OO
- OO
- OOak
- OakOb
- ObeOBO
- ObrOce
- OceOch
- Och
- OctODE
- OdeODO
- odoOf
- OfOff
- OffOgr
- OgrOh
- OhaOis
- OisOka
- OkaOku
- OkuOlc
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOma
- OmaOme
- OMFOn
- OnOne
- OneOne
- ONEOne
- oneOnk
- OnkOnT
- OntOor
- OorOpe
- OpeOpu
- OpuOra
- OraOrc
- OrcOrd
- OrdOrh
- OrhOri
- OriOrl
- OrlOrq
- OrqOrt
- OrtOsa
- OsaOsc
- OscOsm
- Osn
- Otr
- OtrOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxi
- OxiOze
- ozz
- 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
- Oldest Sea
- Oldfield, Mike
- Oldfield, Mike & Anderson, Jon
- Oldfield, Mike feat. Chapman, Roger
- Oldfield, Mike feat. Westenra, Hayley
- Oldfield, Mike with Anderson, Jon
