O'ryan

      O-town

      O-zone

      O.a.r. (of A Revolution)

      O.l.d.

      Oasis

      Obie Trice

      Obituary

      Obliveon

      Obtained Enslavement

      Ocean Colour Scene

      October Fall

      Offspring

      Oingo Boingo

      Ok Go

      Ol Skool

      Ol' Dirty Bastard

      Old 97's

      Oleander

      Olemus

      Olive

      Olivia

      Olivia Newton-john

      Omarion

      Omd

      Omen

      Omnisoul

      On Thorns I Lay

      One Chance

      One Less Reason

      One True Voice

      One Voice

      Onesidezero

      Onyx

      Oomph

      Opera Ix

      Opeth

      Opm

      Order From Chaos

      Ordo Equilibrio

      Orgy

      Originoo Gunn Clapazz

      Orishas

      Orphanage

      Orson

      Osdorp Posse

      Ost

      Otep

      Our Lady Peace

      Ours

      Out Of Eden

      Outfield

      Outkast

      Outlandish

      Outlawz

      Outsidaz

      Ov7

      Oxide & Neutrino

      Oxiplegatz

      Ozma

      Ozomatli

      Ozzy Osbourne