| | - Olly Murs
- Of Monsters and Men
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- Olafur Arnalds & Nils Frahm
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- One Night Only
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- Orchestra del Teatro alla Scala di Milano & Claudio Abbado
- Oren Lavie
- Operator
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- Otherwise
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- Orchestra and Chorus of the Welsh National Opera, Richard Bonynge
- Orange Goblin
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- Ohio Players
- One EskimO
- Onyx
- Olga Scheps
- Orchester der Deutschen Oper Berlin, Giuseppe Sinopoli
- The One Hundred
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- Overkill
- Orchestra and Chorus of The Royal Opera House Covent Garden, Richard Bonynge
- Oberhofer
- The Olms
- Olden Yolk
- Off Road Minivan
- Organectomy
- Orphaned Land
- Ofra Haza
- Omar Dykes
- Orchestra and Chorus of the Royal Opera House, Covent Garden & Sir Georg Solti
- The Only Ones
- Overland
- Oh Susanna
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- ONE OK ROCK
- Orchestra and Chorus of La Scala, Carlo Sabajno
- Olivia O'Brien
- Otto Klemperer
- OFF!
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- One Way
- Orchestre de l'Opera de Paris, Pierre Boulez
- The Original 7Ven
- Oh Laura
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- Operator Please
- The Oak Ridge Boys
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| - Otis Rush
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- Olav Larsen & the Alabama Rodeo Stars
- Omni Trio
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- The Obsessed
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- Osibisa
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- Ottmar Liebert
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- Oh My!
- Otmar Suitner, Staatskapelle Berlin
- Over the Rhine
- Oi Va Voi
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- ORANGE RANGE
- oOoOO
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- One Be Lo
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- The Ocean Blue
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- Oh No! Oh My!
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- Om
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- One Self
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- On Thorns I Lay
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- The Orange Peels
- Ou est le swimming pool
- Odetta
- The Orange Humble Band
- On An On
- One More Girl
- Oliver Wakeman with Steve Howe
- Off With Their Heads
- Oscar D'Leon
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- Old Man's Will
- Oomph!
- Opus 5
- Okilly Dokilly
- Omar Kent Dykes & Jimmie Vaughan
- Organized Konfusion
- Oni
- Olivia Broadfield
- Ola Podrida
- Oophoi & Louisa John-Krol
- Omnia
- Ocean
- Ozark Henry
- Oblivion Sun
- Owen
- Oliver Shanti & Friends
- Oh No Ono
- The Orchids
- The Old Firm Casuals
- Oh, Sleeper
- Outlands
- Ott
- One-Way Mirror
- The Octopus Project
- Omar S
- Orlando Julius
- Oliver Mtukudzi
- Os Mutantes
- Old & In the Way
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- Obits
- October Fall
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- Oranssi Pazuzu
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- Ocote Soul Sounds & Adrian Quesada
- Out Hud
- Oya
- Official Secrets Act
- Oysterband
- Origin
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- Oxia
- Orange Blue
- One Less Reason
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- Oh No Not Stereo
- O+S
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- Outline in Color
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- O
- Omar
- Of Modern Architecture
- Omar Coleman
- Obsequiae
- OperaBabes
- October Falls
- Owen Temple
- Oxmo Puccino
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- Ocean Alley
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- Old Man Markley
- Oval
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- Oxide & Neutrino
- OVERWERK
- Only Crime
- Omar Rodriguez Lopez
- Ogre
- One to One
- Omen
- Ocote Soul Sounds
- One Bad Son
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- The Old Ceremony
- Onslaught
- Obey The Brave
- The One AM Radio
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- O'Death
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- The Olivia Tremor Control
- Oscar Brown Jr.
- Ouroboros
- OHHMS
- One Second Bridge
- Olu Dara
- Outrage
- Ole Borud
- Opera Diabolicus
| - Orchestre Poly-Rythmo
- Oka
- Outworld
- Olusheyi Banjo
- Odds
- The Organ
- Omega
- Old Man Gloom
- Or, The Whale
- Orchestra of Spheres
- Oriol
- The Overseer
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- Operatica
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- Odd Nosdam
- The Ornette Coleman Trio
- Oresund Space Collective
- Old Fire
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- One Minute Silence
- Opio
- Omnihility
- Ozma
- Old Man's Child
- Oscar Peterson, Ray Brown & Milt Jackson
- The Other Half
- Originoo Gunn Clappaz
- OOIOO
- One Without
- The Out Crowd
- The Ornette Coleman Double Quartet
- Othello
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- ohGr
- Owls
- One More Time
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- Ollabelle
- The Open
- Olivia Pedroli
- Osmo Ikonen
- Old Haunts
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- Osunlade
- The Order of Elijah
- Orient Fall
- Ostrich
- October Country
- Oh No
- Over The Ocean
- Otargos
- One-Eyed Doll
- Of Eyes That See
- Officers
- Onetwo
- Olga Kouklaki
- Orange Sunshine
- Orang-Utan
- Ohm-G
- One for the Team
- Otis Clay
- Omnizide
- Opus
- Omar Rodriguez-Lopez
- Odium
- Oedipus
- Outrageous Cherry
- Ortolan
- One Way Ride
- Organic Grooves
- Orwell
- The Owls
- The Opposites
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- Omega Massif
- Ours
- Oceans Divide
- Okoume
- Odjbox
- Out Cold
- October Tide
- Oliver Haidt
- Oureboros
- Osamu Kitajima
- The Oscillation
- Old Man River
- Onkel Tom Angelripper
- On Fillmore
- Oscar + Martin
- Orne
- Orthodox Celts
- Oxmo Puccino & The Jazzbastards
- Ohbijou
- Oogee Wawa
- Open Hand
- OuterSpace
- The O.C. Supertones
- Orup
- Omega Lithium
- Oslo 13
- Opera IX
- Oophoi
- Okay City
- Olin and the Moon
- Oxford Circle
- Obi Fernandez
- Ola Onabule
- Os Pontos Negros
- Oophoi & Tau Ceti
- Old Time Relijun
- Ordog
- Opgezwolle
- One Man Army
- Onesidezero
- Oakalla
- Oslo Swan
- Obelyskkh
- Okera
- One Ton
- On a Pale Horse
- Overseer
- Original Flavor
- Os Paralamas do Sucesso
- Oakenshield
- Opprobrium
- Organix
- Otomo Yoshihide, Bill Laswell, Yoshigaki Yasuhiro
- Oblique Rain
- Osanna
- Okay
- Obscurity
- Oskar Linnros
- Olli Banjo
- On Watership Down
- One Man Army & The Undead Quartet
- O Rappa
- Os Golpes
- Oddjob
- Obfusc
- Overnight Lows
- onelinedrawing
- Odd Project
- Ofrin
- Ocultan
- Ondskapt
- Odyssea
- Ott Lepland
- Onry Ozzborn
- Oholics
- Orange Range
- Outcast
- Of Machines
- Open the Skies
- Onkel Kankel
- Osten med Resten
- Overdose
- Orth
- The Operation
- Oliver Hart
- Ordo Funebris
- Otto
- Opensouls
- Officium Triste
- Our Subatomic Earth
- Order of Ennead
- Orcustus
- One Hundred Hurricanes
- Ogris Debris
- Officer!
- Ono Loco & Lil Toro
- The Original Sinners
- Oz
- Old Hundred
- Odd Nordstoga
- O.C. & PF CUTTIN
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