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. Wilson Owens
20. Jordan Pa**man
21. Katy Perry
22. Rihanna
23. Peter Asbill, Elliot Breece
24. James "J" Sider
25. Allen Stone
26. Taylor Swift
27. Sam Tarantino, Josh Greenberg
28. Alex White
29. Wiz Khalifa
30. Zedd