| Oswald Egger | 0 | 0 |
| Oswald Sallaberger | 1 | 0 |
| Oswald Uhl | 0 | 0 |
| Oswald Van Olmen | 0 | 0 |
| Oswald von Wolkenstein | 0 | 0 |
| Oswaldo Souza J. | 0 | 0 |
| Otakar Brousek | 1 | 0 |
| Otakar Kraus | 1 | 0 |
| Otakar Olšaník | 0 | 0 |
| Otakar Ostrčil | 2 | 0 |
| Otakar Trhlík | 3 | 0 |
| Otakar Vondrovic | 0 | 0 |
| Otar Gordeli | 1 | 0 |
| Otfrid von Weißenburg | 0 | 0 |
| Other Dimensions in Music | 3 | 0 |
| Othman Louati | 0 | 0 |
| Othmar Müller | 0 | 0 |
| Othmar Schoeck | 28 | 0 |
| Othon | 0 | 0 |
| Otis Clay | 0 | 0 |
| Otis Finch | 0 | 0 |
| Otis Murphy | 0 | 0 |
| Otis Shanty | 0 | 0 |
| Otmar Mácha | 2 | 0 |
| Otmar Suitner | 48 | 0 |
| Otomizu | 0 | 0 |
| Otras | 0 | 0 |
| Ots J Huncho | 0 | 0 |
| Otsochodzi | 0 | 0 |
| Ottagone | 0 | 0 |
| Ottaviano Tenerani | 1 | 0 |
| Ottavio Dantone | 43 | 0 |
| Ottavio Garaventa | 1 | 0 |
| Ottawa Bach Choir | 0 | 0 |
| Ottetto Italiano | 0 | 0 |
| Ottilie Patterson | 0 | 0 |
| Otto Ackermann | 18 | 0 |
| Otto Aebi | 2 | 0 |
| Otto Donner | 7 | 0 |
| Otto Edelmann | 5 | 0 |
| Otto Ernst Gregorius Schieferlein | 0 | 0 |
| Otto Frickhoeffer | 0 | 0 |
| Otto Gerdes | 4 | 0 |
| Otto Harbach | 0 | 0 |
| Otto Hashmi | 0 | 0 |
| Otto Jokl | 1 | 0 |
| Otto Katzameier | 2 | 0 |
| Otto Ketting | 0 | 0 |
| Otto Kitzler | 0 | 0 |
| Otto Klemperer | 125 | 0 |
| Otto Kotilainen | 1 | 0 |
| Otto Luening | 0 | 0 |
| Otto Malling | 0 | 0 |
| Otto Matthäus Zykan | 1 | 0 |
| Otto Matzerath | 0 | 0 |
| Otto Mortensen | 0 | 0 |
| Otto Nicolai | 12 | 0 |
| Otto Olsson | 5 | 0 |
| Otto Post | 0 | 0 |
| Otto Romanowski | 0 | 0 |
| Otto Sander | 3 | 0 |
| Otto Sauter | 0 | 0 |
| Otto Schenk | 2 | 0 |
| Otto Singer | 0 | 0 |
| Otto Tausk | 8 | 0 |
| Otto Tolonen | 0 | 0 |
| Otto Virtanen | 1 | 0 |
| Otto Waalkes | 10 | 0 |
| Otto Wiener | 4 | 0 |
| Otto von Rohr | 1 | 0 |
| Otto von Schirach | 0 | 0 |
| Otto von Wernherr | 0 | 0 |
| Ottokar Nováček | 1 | 0 |
| Ottolien | 0 | 0 |
| Ottorino Respighi | 196 | 0 |
| Ottó Herz | 0 | 0 |
| Ottó Kertész | 0 | 0 |
| Ouayiie Musique | 0 | 0 |
| Ouija Macc | 24 | 0 |
| Oulu Sinfonia | 17 | 0 |
| Oulun Kamarikuoro | 1 | 0 |
| Our Ceasing Voice | 0 | 0 |
| Our New Band | 0 | 0 |
| OurVinyl | 0 | 0 |
| Ourkouzounov Ensemble | 0 | 0 |
| Ouseppachan | 0 | 0 |
| Out Of Orbit | 1 | 0 |
| Out of Hand | 0 | 0 |
| Out of Luck! | 0 | 0 |
| Outcome | 0 | 0 |
| Outdate Electro | 0 | 0 |
| Outer Space | 1 | 0 |
| Outer World | 0 | 0 |
| Outernational Meltdown | 0 | 0 |
| Outi Tarkiainen | 4 | 0 |
| Outloved | 0 | 0 |
| Outpost Drive | 0 | 0 |
| Output | 0 | 0 |
| Outro Lado | 0 | 0 |
| Outside | 0 | 0 |