Rap Genius Editor's Note: RG Founders are no longer under 30. 1. Bruno Mars 2. Avicii 3. Justin Bieber 4. J.Cole 5. Miley Cyrus 6. Donnie Dinch 7. Drake 8. Derrick Fung 9. Calvin Harris 10. Hunter Hayes 11. Kim Kaupe 12. Lady Gaga 13. Kendrick Lamar 14. Ryan Lewis 15. Lorde 16. Miguel 17. Janelle Monae 18. One Direction 19. ...Learn More