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Enjoy! And tell what is your opinion ;)

My opinion(Updated on 06/02/2015):
01- Mariah Carey
02- Ariana Grande
03- Kelly Clarkson
04- Celine Dion
05- Beyoncé
06- Whitney Houston
07- Demi Lovato
08- Tessanne Chin
09- Amber Riley
10- Jennifer Hudson
11- JoJo
12- Tamar Braxton
13- Jessie J
14- Alicia Keys
15- Leona Lewis