| Artist | Active | Genre & Styles |
|---|---|---|
| Oomph! | 1990s - 2010s | Pop/Rock, Alternative Metal, Heavy Metal, Industrial Metal, Alternative/Indie Rock, Electro-Industrial |
| Oonagh | 2000s - 2010s | Pop/Rock, New Age, International, Electronic, Pop, Adult Alternative Pop/Rock, Dance-Pop, Ethnic Fusion |