| Oxymoron |
66 |
| Oysterband |
31 |
| Oysterhead |
16 |
| Ozark Henry |
46 |
| Ozark Mountain Daredevils |
46 |
| Ozma |
66 |
| Ozomatli |
51 |
| Ozone |
8 |
| Ozzy Osborn |
3 |
| Ozzy Osborne |
9 |
| Ozzy Osbourne |
225 |
| Olivia Holt |
13 |
| Ole Paus |
4 |
| OMI |
11 |
| Ocean Drive feat. Dj Oriska |
4 |
| Olimpo Cardenas feat. Julio Jaramillo |
3 |
| One More Time |
36 |
| Ozark Henry and The National Orchestra of Belgium |
8 |
| O.R |
7 |
| O.C. Supertones |
63 |
| O'shea |
24 |
| Ocasan |
10 |
| O.C. Smith |
11 |
| O'G3ne |
4 |
| Obstructie |
12 |
| Obsidian Shell |
43 |
| O'Bryan |
4 |
| Obala Daleka |
7 |
| O'brother |
13 |
| Ocean Architecture |
5 |
| Obie Trice |
62 |
| Oh Wonder |
14 |
| Ol' Dirty Bastard |
77 |
| Oj Da Juiceman |
45 |
| Otto Knows |
6 |
| Obsidian Gate |
11 |
| Odium |
19 |
| Opwekking |
69 |
| O.V. Wright |
7 |
| Onyx |
66 |
| Obsidian Kingdom |
5 |
| On |
10 |
| OC |
34 |
| Of No Avail |
23 |
| Oral Bee |
12 |
| Oscar |
7 |
| One Last Regret |
3 |
| Odisseo |
3 |
| Obtest |
34 |
| Onur Ozsu |
4 |
| OneTwo |
4 |
| One OK Rock |
93 |
| Orlando Pops Orchestra |
8 |
| Oblomov |
10 |
| OK Kid |
10 |
| On Thorns I Lay |
42 |
| Oh No Ono |
9 |
| Offenbach |
19 |
| Okej |
3 |
| Outlaw Star |
5 |
| Oslo Ess |
10 |
| One Track Mind |
5 |
| Osiris |
21 |
| Osdorp Posse |
50 |
| Omar |
6 |
| Odorobou Jing |
4 |
| Oesch's Die Dritten |
8 |
| Oh Honey |
11 |
| Outshyne |
3 |
| O.F.T.B |
6 |
| Outsidaz |
16 |
| Ome Henk |
9 |
| Owen Beverly |
8 |
| Osvaldo Murti |
16 |
| Otis Grand |
3 |
| Ostrogoth |
11 |
| Operator |
9 |
| Odszukac listopad |
3 |
| Ooberman |
3 |
| Orange And Lemon |
19 |
| Oswaldo Montenegro |
5 |
| October Baby |
10 |
| Open Strum |
5 |
| Old Sand Mill |
3 |
| One Side Zero |
14 |
| Oussama Belhcen |
3 |
| Opus III |
12 |
| Oscar And The Wolf |
8 |
| One missed may |
4 |
| Orion |
5 |
| Original 3 |
4 |
| Otan Vargas |
8 |
| Our Heart's Hero |
11 |
| Onda, La |
4 |
| Outlawz |
51 |
| One Ton |
3 |
| Oh |
4 |
| OP8 |
4 |
| OHNOFromLa |
3 |
| Omik K |
10 |