Top 30 Greatest Rock Bands Of The 20th Century?

I was wondering if the community would be so kind as to ‘evaluate’ my top 30 list of the greatest Rock bands of our time. I ordered this list based upon what each of the artists accomplished for their respective area of music.
1. The Beatles
2. Rolling Stones
3. Led Zeppelin
4. The Jimi Hendrix Experience
5. Pink Floyd
6. Buddy Holly and the Crickets
7. Elvis Presley
8. Queen
9. Bob Marley and the Wailers
10. Bob Dylan
11. The Who
12. Black Sabbath
13. Eric Clapton
14. The Doors
15. The Beach Boys
16. Elton John
17. The Eagles
18. Simon and Garfunkel
19. Dire Straits
20. U2
21. Metallica
22. Crosby, Stills, Nash & Young
23. The Police
24. Lynyrd Skynyrd
25. Billy Joel
26. Brian Eno
27. Depeche Mode
28. Emmerson, Lake & Palmer
29. Radiohead
30. The Cure