It never fails to make me laugh when somebody refers to Beyoncé as an R&B artist, LMAO.
Well this Billboard article mentions her as an R&B artist, and she's won grammys for her "R&B" music....but yes she does alot of pop as well, but she also does R&B.
CTMH - 2.4 million (got this figure in 2006 from Billboard so it might have increased)
M!ss-5.4 million('')
TT-720,000('')
IND-1.39 million (according the catalog chart June 2009)
FH- 1.19 million (according to Billboard 200)
20. Carrie Underwood, 9,748,000. The country star, 26, was the Season 4 champ on American Idol and later won a Grammy as Best New Artist of 2006. Her 2005 debut, Some Hearts, is her best-seller, with sales of 6,815,000 copies. The album included her chart-topping Idol coronation song "Inside Your Heaven" and the top 10 hit "Before He Cheats."