Band list starting with O:

O'Connor, Sinead O.K. OMD Oasis Object Odysee of Noise Odyssey 2000 Oingo Boingo Ol' Dirty Bastard Oldfield, Mike Oliver Moldan Omala Omniscience Oneiroid Psychosis Oomph! Optical Orange Sector Orb, The Orbital Origin Origin Unknown Orphic Osdorp Posse Out Out Out of Band Experience Out of the Ordinary Outrageous Overflash Overkill Overlords, The Oversoul