There are at least fsixteen bands called C4:
1. a Hardcore band from Bulgaria
2. A rapper from Texas, United States
3. An electronica artist from Ohio, United States
4. A side project of Michael Angelo Batio, a musician from Illinois, United States
5. A DJ from China
6. A hip-hop duo from Florida, United States
7. A rock band from Japan
8. an experimental artist from Belgium
9. A rock band from the United States
10. A reggaeton band from Chile
11. A DJ from Hungary


Read more about C4 on Last.fm.