Adele : Best Singer of the year

The british singer 23 year old Adele is the best singer of 2011. In Billboard.com's rating adele got very higher position so, she also got the position of the first Female singer. Adele got two first ranks in famous albums "21" and "Rolling in the deep" within 1 year
Rihana,Katy perry, Lady gaga got 2nd , 3rd & 4th Ranks respectively.