| Okkervil River |
147 |
| Oklahoma! |
14 |
| Oksana Angel |
23 |
| Oktober |
4 |
| Ol' Skool |
5 |
| Ola |
36 |
| Ola Magnell |
26 |
| Ola Podrida |
5 |
| Ola Svensson |
29 |
| Olaf Henning |
8 |
| Olavi Uusivirta |
41 |
| Old |
25 |
| Old & In The Way |
7 |
| Old (O.L.D.) |
3 |
| Old 97's |
153 |
| Old Bear Mountain |
4 |
| Old Boy Network |
6 |
| Old Canes |
4 |
| Old Ceremony, The |
3 |
| Old Crow Medicine Show |
63 |
| Old Dead Tree |
20 |
| Old Dominion |
4 |
| Old Funeral |
3 |
| Old Lady Drivers |
10 |
| Old Man Gloom |
6 |
| Old Man Luedecke |
19 |
| Old Man Markley |
4 |
| Old Man River |
6 |
| Old Man's Child |
72 |
| Old Mans Child |
9 |
| Old Roger |
8 |
| Oldfield Mike |
11 |
| Oldfield Sally |
7 |
| Oleander |
52 |
| Olehole |
4 |
| Oleta Adams |
39 |
| Olga Tanon |
27 |
| Olga Tañon |
13 |
| Olga Tañón |
89 |
| Olive |
30 |
| Oliver |
31 |
| Oliver Boyd & the Remembralls |
4 |
| Oliver Boyd And The Remembralls |
9 |
| Oliver Dragojevic |
43 |
| Oliver Heldens |
5 |
| Oliver James |
8 |
| Oliver Koletzki |
6 |
| Oliver Onions |
14 |
| Olivia |
63 |
| Olivia Broadfield |
19 |
| Olivia Lewis |
3 |
| Olivia Lufkin |
17 |
| Olivia Newton John |
5 |
| Olivia Newton-John |
422 |
| Olivia Olson |
5 |
| Olivia Ong |
9 |
| Olivia Ruiz |
51 |
| Olivia The Band |
18 |
| Olivier Miller |
9 |
| Ollabelle |
11 |
| Olle Hedberg |
12 |
| Olle Ljungstrom |
5 |
| Olli Banjo |
15 |
| Olli Schulz Und Der Hund Marie |
13 |
| Olly Murs |
107 |
| Olmo |
3 |
| Olodum |
15 |
| Olsen Brothers |
16 |
| Olsen Twins |
44 |
| Olympe |
10 |
| Olympic Year |
3 |
| Olympos Mons |
10 |
| Om |
3 |
| Oman Freestyle |
44 |
| Omar Enrique |
7 |
| Omar Esaú |
9 |
| Omar Pedrini |
17 |
| Omar Rodriguez-Lopez |
3 |
| Omara Portuondo |
24 |
| Omarion |
100 |
| Ombrechiare |
3 |
| Omd |
20 |
| Omega |
13 |
| Omega & Manbo Violento |
4 |
| Omega El Fuerte |
10 |
| Omega Lithium |
5 |
| Omen |
50 |
| Omen Hungary |
10 |
| Ominous Grief |
3 |
| Omnia |
58 |
| Omnious Grief |
3 |
| Omnisoul |
6 |
| Omnium Gatherum |
32 |
| Omsk |
7 |
| Omul Cu Sobolani |
19 |
| On An On |
11 |
| On Broken Wings |
19 |
| On Fire |
3 |
| On Lisa |
4 |
| On The Brink |
6 |