Rest of the list:
1. Taylor Swift (25.1 million)
2. Linkin Park (25 million)
3. Nickelback (23.2 million)
4. Rascal Flatts (22.9 million)
5. Josh Groban (22.3 million)
6. Nelly (21.8 million)
7. Norah Jones (19.1 million)
8. Alicia Keys (18.4 million)
9. Michael Bublé (18.1 million)
10. Coldplay (18.1 million)
11. 50 Cent (16.9 million)
12. P!nk (16.2 million)
13. Beyoncé (15.5 million)
14. John Mayer (14.9 million)
15. Carrie Underwood (14.7 million)
16. Ludacris (14.3 million)
17. Adele (13.8 million)
18. Kelly Clarkson (13.5 million)
19. 3 Doors Down (13.4 million)
20. Kanye West (12,9 million)