| | - Of Monsters and Men
- One Direction
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- Ocean Alley
- Olivier Le Goas Quartet
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- Ozzy Osbourne
- The Orb featuring David Gilmour
- Otis Redding
- Old Crow Medicine Show
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- Offa Rex
- Orion's Reign
- The Ozark Mountain Daredevils
- Objekt
- The Orielles
- One Night Only
- Olafur Arnalds & Nils Frahm
- Orchestral Manoeuvres in the Dark
- One Day as a Lion
- Ovlov
- Opeth
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- Outasight
- Orianthi
- Orleans
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- Ought
- Okkervil River
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- Obliteration
- The Orwells
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- Oh Pep!
- Other Lives
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- Of Mice & Men
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- Outlasted
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- Ohio Players
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- Orchestra Baobab
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- Operus
- The One Hundred
- One EskimO
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- Orchestra del Teatro alla Scala di Milano & Claudio Abbado
- One Dove
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- Orchestra and Chorus of the Welsh National Opera, Richard Bonynge
- Overkill
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- The Only Ones
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- ONE OK ROCK
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- Orchester der Deutschen Oper Berlin, Giuseppe Sinopoli
- The Oscillation
- Operator Please
- Once Human
- The Original 7Ven
- Organectomy
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| - Oleander
- Orange Juice
- Orchestra and Chorus of The Royal Opera House Covent Garden, Richard Bonynge
- Omnimotion
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- Orchestra and Chorus of the Royal Opera House, Covent Garden & Sir Georg Solti
- Oliver Koletzki
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- Orchestra and Chorus of La Scala, Carlo Sabajno
- OPM
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- Orchestre de l'Opera de Paris, Pierre Boulez
- Ottmar Liebert
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- oOoOO
- The Obsessed
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- The Ocean Blue
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- Oh No! Oh My!
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- Otmar Suitner, Staatskapelle Berlin
- Orphaned Land & Amaseffer
- The Oath
- One Self
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- Ou est le swimming pool
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- The Orange Humble Band
- Omar Kent Dykes & Jimmie Vaughan
- On An On
- Orrin Evans
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- Oh No Ono
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- Omnia
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- Oblivion Sun
- Oni
- Owen
- Oh, Sleeper
- On Thorns I Lay
- Ocean
- Ott
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- The Octopus Project
- Os Mutantes
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- Old & In the Way
- Oliver Shanti & Friends
- October Fall
- Obits
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- Orlando Julius
- Origin
- Omar S
- Old Man's Will
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- Out Hud
- Ocote Soul Sounds & Adrian Quesada
- Odonis Odonis
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- Official Secrets Act
- One Less Reason
- Oysterband
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- Overdrive
- Omar
- O
- Of Modern Architecture
- O'Brother
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- October Falls
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- OVERWERK
- The Old Ceremony
- The One AM Radio
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- Oya
- The Olivia Tremor Control
- Oscar Brown Jr.
- Osada Vida
- One Bad Son
- One to One
- One Second Bridge
- Oka
- Omega
- Orion the Hunter
- Or, The Whale
- Orchestre Poly-Rythmo
| - Opera Diabolicus
- Outrage
- Ouroboros
- Outworld
- Ole Borud
- Odds
- OHHMS
- The Organ
- Overdream
- Oriol
- Olusheyi Banjo
- Old Man Gloom
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- The Overseer
- Orchestra of Spheres
- Operatica
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- The Other Tribe
- Oresund Space Collective
- Oceano
- The Ornette Coleman Trio
- Opio
- One Minute Silence
- Ozma
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- Oval
- Old Man's Child
- Oozing Wound
- Oscar Peterson, Ray Brown & Milt Jackson
- Omnihility
- The Other Half
- Originoo Gunn Clappaz
- OOIOO
- One Without
- Ocha la Rocha
- The Ornette Coleman Double Quartet
- The Out Crowd
- Old Fire
- ohGr
- Othello
- One More Time
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- The Open
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- Oh No
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- Orient Fall
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- Of Eyes That See
- Onetwo
- Orange Sunshine
- Olga Kouklaki
- Ohm-G
- One for the Team
- Orang-Utan
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- Omnizide
- Opus
- Omar Rodriguez-Lopez
- Odium
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- One Way Ride
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- Oliver Haidt
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- On Fillmore
- Onkel Tom Angelripper
- Oscar + Martin
- Orne
- Orthodox Celts
- Ohbijou
- Open Hand
- OuterSpace
- The O.C. Supertones
- Orup
- Omega Lithium
- Oxmo Puccino & The Jazzbastards
- Oogee Wawa
- Opera IX
- Oophoi
- Okay City
- Oslo 13
- Oxford Circle
- Ola Onabule
- Olin and the Moon
- Old Time Relijun
- Os Pontos Negros
- Oophoi & Tau Ceti
- Obi Fernandez
- One Man Army
- Ordog
- Opgezwolle
- Onesidezero
- Oakalla
- Oslo Swan
- Obelyskkh
- One Ton
- On a Pale Horse
- Original Flavor
- Overseer
- Okera
- Os Paralamas do Sucesso
- Oakenshield
- O Rappa
- Organix
- Opprobrium
- Otomo Yoshihide, Bill Laswell, Yoshigaki Yasuhiro
- Oblique Rain
- Osanna
- Okay
- Obscurity
- Oskar Linnros
- Olli Banjo
- On Watership Down
- One Man Army & The Undead Quartet
- 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
- Oz
- Old Hundred
- Ole ohne Kohle
- The Original Sinners
- Odd Nordstoga
- O.C. & PF CUTTIN
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