| O Positive | 0 | | 1 |
| oaf | 0 | | 1 |
| Oakwood Grove | 0 | | 1 |
| Oatmeal Pizza | 0 | | 6 |
| Obedient | 0 | | 1 |
| Obituary | 0 | | 70 |
| Obituary - Cause of Death | 0 | | 4 |
| Object Heavy | 0 | | 13 |
| Obscene | 0 | | 3 |
| Obsidian Mind | 0 | | 1 |
| OC Bikefest | 0 | | 4 |
| OC Emo Club | 0 | | 1 |
| Oc3ans | 0 | | 2 |
| Occults | 0 | | 1 |
| Ocean Avenue Stompers | 0 | | 1 |
| Ocean Child | 0 | | 1 |
| Ocean Colour Scene | 0 | | 17 |
| Ocean Sleeper | 0 | | 15 |
| Oceans - Band | 0 | | 2 |
| Oceans In the Sky | 0 | | 1 |
| Oceans Of Origin | 0 | | 1 |
| Oceans of Slumber | 0 | | 4 |
| Oceans Pearl - Jam Tribute | 0 | | 1 |
| Octane | 0 | | 2 |
| Octavia | 0 | | 6 |
| October Man | 0 | | 1 |
| October Noir | 0 | | 2 |
| Octopus Tree | 0 | | 1 |
| Odd Man Out - Cover Band | 0 | | 2 |
| Odd Reality | 0 | | 1 |
| Odds | 0 | | 4 |
| Odds of an Afterthought | 0 | | 1 |
| Odno Okno | 0 | | 1 |
| Odyssey Road - Journey Tribute | 0 | | 2 |
| Of Good Nature | 0 | | 22 |
| Of Many Words | 0 | | 2 |
| Of Montreal | 0 | | 103 |
| Of Nature | 0 | | 1 |
| Of Perception - Tribute to The Doors | 0 | | 1 |
| Of The Dell | 0 | | 3 |
| Of The Heavy Sun | 0 | | 1 |
| Of Wolves | 0 | | 2 |
| Off - Band | 0 | | 17 |
| Off Broadway | 0 | | 2 |
| Off Center | 0 | | 1 |
| Off Guard | 0 | | 1 |
| Off Kilter Karaoke | 0 | | 1 |
| Off Season | 0 | | 2 |
| Off The Chart | 0 | | 2 |
| Off The Railz | 0 | | 4 |
| Off The Rock - Great Big Sea Tribute | 0 | | 5 |
| Offensive | 0 | | 1 |
| Office Culture | 0 | | 1 |
| Officer Dick - Tribute To The Music of Tony Hawk Pro Skater | 0 | | 1 |
| Official Claire | 0 | | 3 |
| Often Easy | 0 | | 1 |
| Often Home | 0 | | 1 |
| Ogre | 0 | | 9 |
| Oh My Lover - PJ Harvey Tribute | 0 | | 1 |
| Oh Vinnie | 0 | | 1 |
| Oh What A Night of Doo Wop Rock N Roll | 0 | | 8 |
| Oh What a Night of Rock n Roll | 0 | | 4 |
| Ohio Is For Covers | 0 | | 2 |
| Ohm Foam | 0 | | 1 |
| Oingo Boingo Dance Party | 0 | | 1 |
| Ok Computer Celebration | 0 | | 1 |
| OK Cool | 0 | | 3 |
| OK Cowgirl | 0 | | 4 |
| Ok NOT Ok - Radiohead Tribute | 0 | | 3 |
| Ok Tyler | 0 | | 2 |
| Okay Boomhauer | 0 | | 1 |
| Okay Kenedi | 0 | | 3 |
| Okean Elzy | 0 | | 20 |
| Oklahoma Stackhouse | 0 | | 6 |
| Okra Pickles | 0 | | 1 |
| OLaochra | 0 | | 1 |
| Old 97s - Rock Band | 0 | | 11 |
| Old and In The Way Tribute | 0 | | 4 |
| Old Blood | 0 | | 2 |
| Old Bob - A Bob Dylan Tribute | 0 | | 4 |
| Old Brier | 0 | | 1 |
| Old Cross | 0 | | 1 |
| Old Days - Tribute to Chicago | 0 | | 2 |
| Old Heavy Hands | 0 | | 5 |
| Old Lady | 0 | | 1 |
| Old Man Thunder | 0 | | 1 |
| Old Neon | 0 | | 6 |
| Old North End | 0 | | 1 |
| Old School - Big Hair Band | 0 | | 1 |
| Old School Music Festival | 0 | | 1 |
| Old Shoe | 0 | | 5 |
| Old Voltage - AC/DC Tribute | 0 | | 2 |
| Oldies 2 Souldies | 0 | | 3 |
| Oldsoul | 0 | | 4 |
| Oleander | 0 | | 1 |
| Olen | 0 | | 5 |
| Oliver Penn | 0 | | 1 |
| Oliver Sean | 0 | | 1 |
| Olivia Rubini | 0 | | 6 |
| Ollie Gullick | 0 | | 2 |
| OLUM | 0 | | 1 |
| Olympia | 0 | | 2 |
| Omaha Rocks Unplugged | 0 | | 1 |
| Omaha Sound | 0 | | 1 |
| Omar Jose Cardona | 0 | | 2 |
| Omari Neville and the Fuel | 0 | | 1 |
| OMD - Orchestral Manoeuvres in the Dark | 0 | | 36 |
| Omega 9 | 0 | | 1 |
| Omiwimo | 0 | | 1 |
| Omnipotent Youth Society | 0 | | 8 |
| On Tap Band | 0 | | 3 |
| On the Streets Again | 0 | | 2 |
| Once Bitten - Great White Tribute | 0 | | 4 |
| Once Upon A Fang | 0 | | 1 |
| OndoStereo - A Tribute to Soda Stereo | 0 | | 1 |
| One - A Tribute To U2 | 0 | | 2 |
| One Arm Straight Jacket | 0 | | 1 |
| One Bad Son | 0 | | 3 |
| One Billion Lions | 0 | | 1 |
| One Celebration Of U2 | 0 | | 1 |
| One Direction Night - Tribute | 0 | | 44 |
| One Fest | 0 | | 1 |
| One Final Show In Lakewood | 0 | | 1 |
| One Last Saturday Night - An All-Star Lineup of Jam Band Luminaries | 0 | | 1 |
| One Leg One Eye | 0 | | 1 |
| One Less Guest | 0 | | 1 |
| One Man Gone - Grateful Dead Tribute | 0 | | 2 |
| One More Silver Dollar | 0 | | 1 |
| One Night Band | 0 | | 1 |
| One Night in the City (Dio Tribute) | 0 | | 1 |
| One Night Live | 0 | | 3 |
| ONE NIGHT STAND | 0 | | 2 |
| One Night Stanleys | 0 | | 1 |
| One Night with Elvis - Elvis Impersonator Night | 0 | | 5 |
| One Night With The King | 0 | | 5 |
| One Ok Rock | 0 | | 19 |
| One or Eight | 0 | | 5 |
| One Particular Harbour - Jimmy Buffett Tribute | 0 | | 2 |
| One Silent Night | 0 | | 1 |
| One Step Beyond | 0 | | 2 |
| One Voice a Concert with A Heartbeat | 0 | | 1 |
| One Way Out PDX - Allman Brothers Tribute | 0 | | 8 |
| One Way Terror | 0 | | 1 |
| One Way Truckin | 0 | | 1 |
| One Wild Night - Bon Jovi Tribute | 0 | | 3 |
| One-Man Johnson | 0 | | 1 |
| Oneida | 0 | | 15 |
| ONES - Beatles Number 1 Hits | 0 | | 4 |
| Ones - The Beatles #1 Hits | 0 | | 7 |
| Ones - The number 1 Beatles Hits | 0 | | 9 |
| Onesie | 0 | | 1 |
| Onion | 0 | | 2 |
| Only Alibis | 0 | | 1 |
| Only Dan's - Steely Dan Tribute | 0 | | 1 |
| Only Yesterday - Tribute | 0 | | 1 |
| ONOFF | 0 | | 1 |
| Onset | 0 | | 1 |
| Onslaught | 0 | | 13 |
| Onward Debacle | 0 | | 1 |
| Oof Fighters | 0 | | 2 |
| oogwes | 0 | | 1 |
| Opal Agafia and The Sweet Nothings | 0 | | 3 |
| Open City | 0 | | 1 |
| Open D3cks | 0 | | 1 |
| Open Electric Jam | 0 | | 1 |
| Operation Blankshot - Operation Ivy Tribute | 0 | | 1 |
| Operation Dead Head | 0 | | 1 |
| Operation Song | 0 | | 2 |
| Operators | 0 | | 1 |
| Opiate | 0 | | 6 |
| Opie Gone Bad | 0 | | 1 |
| OPM Summer Fest | 0 | | 6 |
| Opposite Day | 0 | | 1 |
| Opposite Standard | 0 | | 1 |
| Oppressed Logic | 0 | | 1 |
| Optic Sink | 0 | | 1 |
| Opulent Oddities | 0 | | 1 |
| Or Does it Explode | 0 | | 3 |
| Orange 9mm | 0 | | 3 |
| Orange Doors | 0 | | 1 |
| Orange Mammoth | 0 | | 1 |
| Orangetree | 0 | | 1 |
| Oranssi Pazuzu | 0 | | 13 |
| Oray Band | 0 | | 2 |
| Orbison Still | 0 | | 3 |
| Orchestral Rock Odyssey | 0 | | 3 |
| Orchid - Band | 0 | | 13 |
| Orchid In The Ivy - A Tribute To Nirvana | 0 | | 2 |
| Orcutt Shelley Miller | 0 | | 3 |
| Order Of The Black Star - David Bowie Tribute | 0 | | 3 |
| Ordinary Boys | 0 | | 3 |
| Orebolo | 0 | | 6 |
| Orefice Roth | 0 | | 1 |
| Organ Trail | 0 | | 3 |
| Organ Trio Concert | 0 | | 1 |
| ORGANically Dead | 0 | | 1 |
| Origin | 0 | | 2 |
| Original Silver Bullet - Bob Seger Tribute | 0 | | 1 |
| Orillia | 0 | | 4 |
| Orillia Beatlemania | 0 | | 1 |
| Orion | 0 | | 2 |
| Orions Belte | 0 | | 33 |
| Orlando Funk Fest | 0 | | 1 |
| Orlando Rocks! | 0 | | 4 |
| Orloge Simard | 0 | | 4 |
| Ornament - A Tribute to TSO | 0 | | 3 |
| Orphan Source | 0 | | 1 |
| Orthodox | 0 | | 51 |
| Osees DJ Set | 0 | | 1 |
| Oskar and Julia | 0 | | 1 |
| Osler Circle | 0 | | 5 |
| OSSIFER | 0 | | 1 |
| Otan Vargas | 0 | | 1 |
| OTB - Old Tall Buildings | 0 | | 2 |
| Other Brothers - Allman Brothers Band Tribute | 0 | | 6 |
| Other Vessels | 0 | | 1 |
| Otherwise | 0 | | 6 |
| Otherworld | 0 | | 3 |
| Otis Gibbs | 0 | | 7 |
| Otoboke Beaver | 0 | | 48 |
| Otto Benson | 0 | | 3 |
| Ottto | 0 | | 12 |
| Our Common Collapse | 0 | | 1 |
| Our Day Will Come - NEO Women Rock | 0 | | 1 |
| Our Name Is Jonas | 0 | | 1 |
| Ouster Nash | 0 | | 1 |
| Out Come the Wolves | 0 | | 1 |
| Out of Eden - A Tribute to The Eagles | 0 | | 18 |
| Out of Focus | 0 | | 4 |
| Out of Pocket | 0 | | 1 |
| Out Of The Void | 0 | | 3 |
| Outatime | 0 | | 2 |
| Outer Heaven | 0 | | 1 |
| Outer Reef | 0 | | 1 |
| Outernational | 0 | | 3 |
| OUTLAW COUNTRY - A Tribute to Johnny Cash and Waylon Jennings | 0 | | 2 |
| Outlaws In The Golden State | 0 | | 1 |
| Outlier | 0 | | 4 |
| Outline in Color | 0 | | 13 |
| Outside The Wall - Pink Floyd Tribute Band | 0 | | 1 |
| Outta My Head | 0 | | 2 |
| Over The Edge Tuesdays | 0 | | 1 |
| Over The Limit Tour | 0 | | 2 |
| Over the Shire and Far Away - Lord of the Rings and Led Zeppelin Tribute | 0 | | 2 |
| Over the Wire | 0 | | 1 |
| Overboard | 0 | | 7 |
| Overboard - The Love Boat Band | 0 | | 1 |
| Overdose | 0 | | 1 |
| Overdrive Orchestra | 0 | | 2 |
| Overland | 0 | | 1 |
| Overpour | 0 | | 1 |
| Oversight | 0 | | 1 |
| Overtime Winner | 0 | | 3 |
| Ovira | 0 | | 3 |
| Ovrwashed | 0 | | 1 |
| Ovtlier | 0 | | 7 |
| Owel | 0 | | 1 |
| Owen Stewart | 0 | | 1 |
| Owl City | 0 | | 41 |
| Owls | 0 | | 5 |
| OXA - The Band | 0 | | 1 |
| Oxbow | 0 | | 3 |
| Oxmoor | 0 | | 5 |
| Oye Mi Amor Fiesta De Rock | 0 | | 1 |
| Oyo | 0 | | 3 |
| Ozello | 0 | | 2 |
| Ozonic | 0 | | 1 |
| Ozzfest | 0 | | 2 |
| Ozzolution | 0 | | 1 |
| Ozztin | 0 | | 2 |
| Ozzy and Metallica Tribute | 0 | | 2 |
| Ozzy Osbourne | 0 | | 6 |
| Ozzy Osbourne Tribute | 0 | | 1 |
| Ozzy Osbourne vs Van Halen Tribute Nite | 0 | | 1 |
| Ozzy Resurrected | 0 | | 1 |
| OZZY vs AC/DC Halloween Rock and Roll Tribute Showdown | 0 | | 1 |
