Complete Artist List
- Michael O
- O C Supertones
- Cormac O Caoimh
- O Pioneers!!!
- O Yuki Conjugate
- Heather O' Neill
- O'briens Enemy
- O'brother
- Jennifer O'connor
- Mark O'connor
- Sinead O'connor
- O'death
- Charlotte O'hara
- Mike O'Neill
- Tim O'reagan
- Chrisopher O'Riley
- O.w.l
- Paul Oakenfold
- Oasis
- Oberhofer
- Obersoundz
- Conor Oberst
- Obits
- Obituary
- Oblivians
- Oblivious Signal
- Obscured By Clouds
- Obscurus
- Obsydian
- Occidental Brothers Dance Band International
- The Ocean
- Ocean Blue
- Ocean Colour Scene
- Oceana
- Oceansize
- Ockhamz Razor
- Ocote Soul Sounds And Adrian Quesada
- Ocrilim
- Octoberman
- Octopus Project
- Odawas
- Odd Austin
- Odd Future
- Odd Modern
- Oddibe
- The Odds
- Odiorne
- Odium
- Odoghan
- Odonis Odonis
- Burna Of Fresh Off Tha Block Ent
- Of Mice And Men
- Of Monsters And Men
- Of Montreal
- Off Orbit
- Off!
- The Offramps
- The Offspring
- Ofwgkta
- Ogdens
- Oh Condor
- Oh No
- Oh No Not Stereo
- Oh No Oh My
- Oh So Peligroso
- Oh Susanna
- Oh, Sleeper
- Oh, The Story!
- Ohbijou
- Ohgr
- Ohio Players
- Oilcan Art
- Ojos De Brujo
- Ok Go
- Okkervil River
- Tim Oksanen
- Ola Podrida
- The Old 97s
- Old Crow Medicine Show
- Old Man Gloom
- Old Men Die In New Suits
- Old Reliable
- Old Time Relijun
- Will Oldham
- Oleander
- Oleg Prodeus
- Olekranon
- Olivia Tremor Control
- Mark Olson
- Oly
- Olya
- Olympia
- Om
- Wayne Omaha
- Omar Souleyman
- Omerta
- Omnimi
- Omnium Gatherum
- Omnivox
- On An On
- The On Fires
- On The Might Of Princes
- Once Just
- The One Am Radio
- One Be Lo
- One Day As A Lion
- One Eskimo
- One Eyed Jacks
- One Hundred Dollars
- One Inch Punch
- One King Down
- One Man Army
- One Minute Silence
- One Night Band
- One Night Only
- One Small Step For Landmines
- One Star Hotel
- One Step Away
- The One Through Tens
- One True Topi Tribe
- The One Up Downstairs
- One Win Choice
- One World Revolution
- One-Eyed Doll
- Oneirism
- Onerepublic
- Yuji Oniki
- Only Flesh
- The Only Ocean
- The Only Ones
- Onnyk
- Onyx
- Oohlas
- Ooioo
- Open
- Operation Ivy
- Operation Makeout
- Operator Generator
- The Operators 780
- Opeth
- Opin
- Opio
- Opium Symphony
- The Opus
- Orange
- Orange 9mm
- Orange Beauties
- Orange Goblin
- Orange Juice
- The Oranges Band
- Orb
- The Orbans
- Roy Orbison
- Orbit Service
- Orbital
- Orchestral Manoeuvres In The Dark
- Ordo Obsidium
- Oren Ambarchi
- The Organ
- The Organ Beats
- Organic Thoughts
- Orianthi
- Origamibiro Origamibiro
- Original Heteroes
- The Original Mark Edwards
- The Original Rockridge Brothers
- The Orion Experience
- Orly
- Orpheus
- Ryan David Orr
- Orthodox
- Beth Orton
- Oryan
- Os Mutantes
- Joan Osborne
- Ozzy Osbourne
- Osker
- Ostinato
- Otep
- Other Lives
- Other Natural Flavors
- The Other People Place
- Other Voices
- Otomo Yoshihide
- Carey Ott
- Josh Ottum
- Oui Party
- Our Friend & The Spiders
- Our Ghosts
- Our Lady Peace
- Our Last Night
- Our Mercury
- Our Subatomic Earth
- Our Twilight Pastime
- Our Vinyl Vows
- Ours
- Out Hud
- Outasight
- The Outdoor Types
- The Outer Vibe
- Outernationalists
- Outkast
- Outrageous Cherry
- Ov
- Oval
- Ovdk
- Over It
- Over Stars And Gutters
- Over The Hill
- Over The Rhine
- Overcast
- Overdoes Kunst
- Overhate
- Rob Overseer
- Oversol
- Ovo
- Owen
- Katie Owen
- Owen Pallett
- Owl City
- Owls
- Owsley
- The Owsley Brothers
- Ox
- Oxford Collapse
- The Oxford Coma
- Oxia
- Oz
- Ozomatli
