| | - Of Monsters and Men
- One Direction
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- Ona
- Of Virtue
- Operators
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- The Orb featuring David Gilmour
- Otis Redding
- Old Crow Medicine Show
- Orgone
- The O'Jays
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- One Night Only
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- The Outfield
- One Day as a Lion
- Orchestral Manoeuvres in the Dark
- O.A.R.
- Olafur Arnalds & Nils Frahm
- Olivia Chaney
- Orianthi
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- O-Zone
- Olafur Arnalds
- Opeth
- Obscure Infinity
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- Ought
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- Outlasted
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- The Only Ones
- Otis Taylor
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- Oleander
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| - Obituary
- The Oak Ridge Boys
- Omnimotion
- Otto Klemperer
- Octopus
- Oumou Sangare
- Out of Eden
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- Orchestra del Teatro alla Scala di Milano & Claudio Abbado
- One Dove
- Oliver Koletzki
- Oceana
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- OPM
- Oomph!
- Orchestra and Chorus of the Welsh National Opera, Richard Bonynge
- Our Broken Garden
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- Oxford Collapse
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- ORANGE RANGE
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- One Be Lo
- Once Human
- Olivier Le Goas Quartet
- Otis Gibbs
- Oh My!
- Owel
- oOoOO
- Orchester der Deutschen Oper Berlin, Giuseppe Sinopoli
- Organectomy
- The Ocean Blue
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- Old and New Dreams
- Oh No! Oh My!
- Ost & Kjex
- Oxbow
- Omar & The Howlers
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- Our Last Night
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- Only Men Aloud
- Olav Larsen & the Alabama Rodeo Stars
- Ornette
- Oliver Schories
- Owiny Sigoma Band
- One Self
- O'Donel Levy
- Octo Octa
- The Oath
- Opus III
- Orchestra and Chorus of The Royal Opera House Covent Garden, Richard Bonynge
- Odyssice
- The Outsiders
- Orchestra and Chorus of the Royal Opera House, Covent Garden & Sir Georg Solti
- Orphaned Land & Amaseffer
- ONWE
- Oliver Huntemann
- Orchestra and Chorus of La Scala, Carlo Sabajno
- Ornette Coleman
- Ours
- Oregon
- Odetta
- Oliver Wakeman with Steve Howe
- Oneman
- Orchestre de l'Opera de Paris, Pierre Boulez
- Oliva
- Ou est le swimming pool
- The Orange Peels
- Oscar D'Leon
- One More Girl
- Oddarrang
- Oliver Mtukudzi
- Omar Kent Dykes & Jimmie Vaughan
- Ocean
- Ozark Henry
- Odd Couple
- Organized Konfusion
- Olivia Broadfield
- Olin & The Moon
- Old & In the Way
- The Orange Humble Band
- Orlando Julius
- Oh No Ono
- Opus 5
- On An On
- The Orchids
- Ola Podrida
- Ott
- Owen
- Oh, Sleeper
- Otmar Suitner, Staatskapelle Berlin
- Oblivion Sun
- Os Mutantes
- Omar Sosa
- The Octopus Project
- Off With Their Heads
- Outlands
- October Fall
- Orba Squara
- Obits
- One-Way Mirror
- Oni
- Orrin Evans
- Out Hud
- On Thorns I Lay
- Oded Tzur
- Only Child
- Ocote Soul Sounds & Adrian Quesada
- Official Secrets Act
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- Orange Blue
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- Oesch's die Dritten
- Oh No Not Stereo
- Oliver Shanti & Friends
- Oxia
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- Oscar Brown Jr.
- Omnia
- Omar S
- One Less Reason
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- O
- October Falls
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- Of Modern Architecture
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- Old Man Markley
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- OperaBabes
- Oxide & Neutrino
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- Owen Temple
- Outline in Color
- Obsequiae
- Omar Rodriguez Lopez
- Ocote Soul Sounds
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- Old Man's Will
- O'Death
- The One AM Radio
- Onslaught
- Omar Coleman
- The Old Ceremony
- Only Crime
- Omen
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- Ogre
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- Oxmo Puccino
- The Olivia Tremor Control
- One Second Bridge
- Or, The Whale
- OVERWERK
- Oka
- Omega
- Ole Borud
- Orchestre Poly-Rythmo
- Overhead
- Opera Diabolicus
| - Outworld
- Outrage
- O'Ryan
- Odds
- One Bad Son
- One to One
- The Organ
- The Oscillation
- Ouroboros
- Orion the Hunter
- Outrageous Cherry
- Oriol
- Operatica
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- Old Canes
- Orenda Fink
- October Project
- The Overseer
- Odd Nosdam
- Ozma
- Olusheyi Banjo
- The Other Tribe
- Orchestra of Spheres
- Old Man's Child
- OHHMS
- Opio
- Oresund Space Collective
- One More Time
- One Minute Silence
- Ollabelle
- The Ornette Coleman Trio
- Oya
- Originoo Gunn Clappaz
- Oscar Peterson, Ray Brown & Milt Jackson
- OOIOO
- Oozing Wound
- Oceano
- The Other Half
- Orang-Utan
- One Without
- The Ornette Coleman Double Quartet
- Omnihility
- ohGr
- The Out Crowd
- Othello
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- Overdream
- The Open
- Old Haunts
- Onetwo
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- Oh No
- Olivia Pedroli
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- The Order of Elijah
- Over The Ocean
- Octavia Sperati
- October Country
- Ocha la Rocha
- Old Fire
- Officers
- Orient Fall
- Orange Sunshine
- Otargos
- Ohm-G
- Olga Kouklaki
- Oval
- Of Eyes That See
- One-Eyed Doll
- One for the Team
- Omotai
- Otis Clay
- Omar Rodriguez-Lopez
- Opus
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- One Way Ride
- The Owls
- Oxford Circle
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- Orwell
- The Opposites
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- Omega Massif
- Old Man River
- Opprobrium
- Obelyskkh
- Oceans Divide
- October Tide
- Osamu Kitajima
- Oakenshield
- Oliver Haidt
- Oureboros
- On Fillmore
- Onkel Tom Angelripper
- Oscar + Martin
- Okoume
- Orne
- Orthodox Celts
- Odjbox
- Ohbijou
- Open Hand
- OuterSpace
- The O.C. Supertones
- Orup
- Out Cold
- Omega Lithium
- Okay City
- Oophoi
- Opera IX
- Ola Onabule
- Oxmo Puccino & The Jazzbastards
- Old Time Relijun
- Oogee Wawa
- Os Pontos Negros
- Oslo 13
- Oophoi & Tau Ceti
- One Man Army
- Onesidezero
- Ordog
- Oakalla
- Opgezwolle
- Oslo Swan
- One Ton
- Olin and the Moon
- Obi Fernandez
- Original Flavor
- On a Pale Horse
- Overseer
- Os Paralamas do Sucesso
- Okera
- O Rappa
- Organix
- Otomo Yoshihide, Bill Laswell, Yoshigaki Yasuhiro
- Oblique Rain
- Osanna
- Olli Banjo
- Okay
- Obscurity
- Oskar Linnros
- 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
- Oliver Hart
- The Operation
- Ordo Funebris
- Otto
- Opensouls
- Officium Triste
- Our Subatomic Earth
- Order of Ennead
- Orcustus
- One Hundred Hurricanes
- Ono Loco & Lil Toro
- Oz
- Old Hundred
- Ole ohne Kohle
- Officer!
- The Original Sinners
- Odd Nordstoga
- O.C. & PF CUTTIN
- Ogris Debris
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