| O |
3 |
| O Desolation |
2 |
| O Emperor |
2 |
| O Inimigo |
5 |
| O Karaiva |
3 |
| O Pioneers!!! |
12 |
| O Rappa |
84 |
| O Sonso |
3 |
| O Surto |
28 |
| O Teatro Mágico |
52 |
| O Terno |
34 |
| O Terço |
23 |
| O' Cealleigh |
5 |
| O'Brother |
2 |
| O'Casan |
3 |
| O'Connor |
72 |
| O'G3NE |
7 |
| O'Landa Draper and the Associates |
5 |
| O'Neill |
2 |
| O'QueStrada |
4 |
| O'Ryan |
12 |
| O'Yaba |
2 |
| O'funk'illo |
34 |
| O+S |
11 |
| O-Town |
2 |
| O-Zone |
28 |
| O-shen |
16 |
| O. Children |
15 |
| O. G. Style |
3 |
| O.A.R. |
104 |
| O.A.R. (Of A Revolution) |
2 |
| O.C. |
38 |
| O.C. Smith |
9 |
| O.C. Supertones (The) |
3 |
| O.F.T.B. |
4 |
| O.G.C. |
25 |
| O.L.D. |
24 |
| O.M. Soneta |
12 |
| O.P. Nayyar |
4 |
| O.P.KING |
3 |
| O.S.T.R. |
231 |
| O.S.T.R. & Hades |
16 |
| O.S.T.R. & Marco Polo |
9 |
| O.S.T.R. & Sofa |
2 |
| O.T. Genasis |
15 |
| O.Torvald |
2 |
| O.V. Wright |
7 |
| OAEOZ |
6 |
| OAG |
26 |
| OBB |
5 |
| OBK |
95 |
| OCEANLANE |
34 |
| OCS |
2 |
| ODESZA |
7 |
| ODESZA feat. Zyra |
2 |
| OFF! |
19 |
| OG Hindu Kush |
11 |
| OG Maco |
29 |
| OG Ron C |
4 |
| OGB |
3 |
| OH MY GIRL |
20 |
| OH!hello |
10 |
| OHL |
23 |
| OHN |
2 |
| OHO |
5 |
| OJ Law |
8 |
| OJ da Juiceman |
12 |
| OK Band |
8 |
| OK Go |
72 |
| OK KID |
30 |
| OK Sweetheart |
6 |
| OKAMOTO’S |
35 |
| OKAY |
2 |
| OKEAN ELZY |
2 |
| OKS |
3 |
| OLDCODEX |
74 |
| OLIVIA |
60 |
| OLIVIA inspi' REIRA (TRAPNEST) |
4 |
| OMC |
11 |
| OMERTA |
2 |
| OMI |
14 |
| ON AN ON |
18 |
| ON/OFF |
6 |
| ONE OK ROCK |
91 |
| ONE☆DRAFT |
2 |
| ONMYO‐ZA |
2 |
| ONSIND |
7 |
| OOHYO |
13 |
| OOMPH! |
4 |
| OP8 |
5 |
| OPIUM project |
5 |
| OPM |
33 |
| OQuadro |
9 |
| OR |
6 |
| ORANGE RANGE |
92 |
| ORBS |
10 |
| ORESKABAND |
38 |
| ORIGA |
55 |
| ORIGINAL LOVE |
15 |
| ORO |
5 |