Genres
- Avant-Garde
- Blues
- Children's
- Classical
- Comedy/Spoken
- Country
- Easy Listening
- Electronic
- Folk
- Holiday
- International
- Jazz
- Latin
- New Age
- Pop/Rock
- R&B
- Rap
- Reggae
- Religious
- Stage & Screen
- Vocal
- Pop/Rock
One Direction 25
OneRepublic 53
Ozzy Osbourne 88
Oasis 51
Owl City 46
Olivia Newton-John 48
Of Monsters And Men 11
Olly Murs 17
Orchestral Manoeuvres In The Dark 39
Opeth 39
Overkill 48
Old Crow Medicine Show 15
Outlaws 23
Orbital 46
Old Dominion 10
Orb 92
O.A.R. 21
Orleans 17
Oingo Boingo 33
Old 97's 27
Ozric Tentacles 51
Omi 3
Of Mice & Men 16
Ocean Colour Scene 40
Ozark Mountain Daredevils 5
Omarion 13
Orianthi 6
Our Lady Peace 15
Odesza 11
OK GO 10
Olafur Arnalds 21
Obituary 24
Our Last Night 35
Otherwise 8
Orgy 15
Omar & the Howlers 23
Otep 11
Oleta Adams 11
Ofra Haza 11
Odyssey 16
Okkervil River 17
Of Montreal 25
Orange Juice 13
Orange Goblin 10
Over The Rhine 25
One Ok Rock 23
Ohio Express 4
Oh Wonder 12
Oomph! 41
Oysterband 13
Onslaught 13
Omnia 15
Omar 15
Orden Ogan 10
The Ocean 21
Oriya
Outsiders 7
Oh Land 9
Outcast 4
Operation Ivy 5
Outasight 9
Omen 10
Ozomatli 8
Orchid 9
Orphaned Land 10
Os Mutantes 20
Operation: Mindcrime 4
Other Lives 5
Ottawan 26
Ornella Vanoni 11
Obsession 7
Oceansize 21
Obscura 6
OM 14
One Night Only 4
One Less Reason 9
Otto Knows 3
Oh, Sleeper 5
Oz 14
Offer Nissim 12
O-Town 3
Odin 10
Oleander 6
Ofenbach 6
Old Man's Child 8
Oliver Koletzki 18
Omnium Gatherum 12
Orion 19
Oophoi 47
Oliver Heldens 2
Oceana 6
Overland 7
One Tree Hill
Owen Pallett 7
Oscar And The Wolf 3
Osanna 11- Offenbach 8
Oonagh 7
One Desire 2
— Artist has been update in past 30 days- Artist 3— Artist has more than two albums