[Shaun]

1. M.I.A. - Y.A.L.A.
2. V V Brown - The Apple
3. M.I.A. - Double Bubble Trouble
4. Iggy Azalea - Work
5. M.I.A. - Come Walk With Me
6. Ariana Grande - Problem (feat. Iggy Azalea)
7. Miley Cyrus - We Can't Stop
8. Kanye West - Black Skinhead
9. M.I.A. - Bring the Noize
10. RuPaul - Sissy that Walk
11. Tegan and Sara - Closer
12. Lady GaGa - Do What U Want (feat. R Kelly)
13. The Saturdays - What About Us
14. Passion Pit - Constant Conversations
15. Pitbull - Timber (feat. Ke$ha)
16. Arcade Fire - Reflektor
17. John Grant - Pale Green Ghosts
18. M.I.A. - Bad Girls
19. Lily Allen - Hard Out Here
20. Nicki Minaj - Anaconda
21. Drake - Hold On, We're Going Home
22. Icona Pop - I Love It
23. Charli XCX - You (Ha Ha Ha)
24. Janelle Monae - Q.U.E.E.N. (feat. Erykah Badu)
25. DJ Fresh vs Jay Fay - Dibby Dibby Sound (feat. Ms Dynamite)

this isn't really reflective of all-time though... only had this itunes for a year or so

last.fm charts (since 2006):