• O
• Karen O
• Sinéad O'connor
• Tara Jane O'Neil
• Jim O'Rourke
• Oasis
• Agnes Obel
• Frédéric D. Oberland
• Conor Oberst
• Object
• Oboken
• Frank Ocean
• Ocean Colour Scene
• Oceansize
• Oddfellows Casino
• Odessey & Oracle And The Casiotone Orchestra
• Odezenne
• Of Montreal
• Of The Wand And The Moon
• Off Models
• Off!
• Oh No! Oh My!
• Ohgr
• The OhSees
• Oingo Boingo
• Oiseaux-Tempête
• Okada
• Okay
• Okkervil River
• Ol.
• The Old Dead Tree
• Old Time Relijun
• Will Oldham
• Charles C. Oldman
• Olen'k
• Nick Oliveri
• The Olivia Tremor Control
• Angel Olsen
• Om
• Omd - Orchestral Manoeuvres In The Dark
• Omega Massif
• OMR
• On
• On The Might Of Princes
• One Day As A Lion
• One Inch Punch
• One More Season
• One Time Angels
• One-Speed Bike
• Oneida
• Onelinedrawing
• Oneohtrix Point Never
• Yuji Oniki
• The Only Ones
• OOIOO
• Ooooo
• OP8
• Opac
• Open Mike Eagle
• Openheimer Analysis
• Operator
• Opeth
• The Opposition
• Orange Alabaster Mushroom
• Orange Goblin
• Orange Juice
• Oranger
• Oranssi Pazuzu
• Orb
• Orbital
• Orchestra Of Constant Distress
• Orchestre Tout Puissant Marcel Duchamp
• Orchid
• The Orchids
• Bill Orcutt
• Order
• The Organ
• Original Silence
• Orthrelm
• Beth Orton
• Orval Carlos Sibelius
• The Orwells
• The Oscillation
• Osculum Infame
• Oslo Telescopic
• The Others
• Christine Ott
• Ought
• Our Brother The Native
• Out Hud
• Outfit
• Outside The Air
• Overhead
• Overmars
• Ovuca
• Owlle
• Christine Owman
• Oxbow
• Oxes
• Oxmo Puccino
• Oysterhead