1. Adele
2. Taylor Swift
3. Beyoncé
4. Lana Del Rey
5. Alicia Keys
6. Adele
7. Norah Jones
8. Dido
9. Sia
10. Amy Winehouse
11. Celine Dion
12. Mariah Carey
13. Whitney Houston
14. Christina Aguilera
15. Kelly Clarkson
16. Pink
17. Jessie J
18. Ariana Grande
19. Demi Lovato
20. Rihanna
