<Tr> <Th> Source </Th> <Th> Rating </Th> </Tr> <Tr> <Td> AllMusic </Td> <Td> </Td> </Tr> <P> The soundtrack CD became a best seller, certified eight times platinum as of October 2007 with sales of 7.9 million copies in the United States as of January 2015 . It won the Grammy Award for Album of the Year in 2002, the Grammy Award for Best Country Collaboration with Vocals (for singer Dan Tyminski, whose voice overdubbed George Clooney's in the film on "I Am a Man of Constant Sorrow", Nashville songwriter Harley Allen, and the Nashville Bluegrass Band's Pat Enright), and the Grammy Award for Best Male Country Vocal Performance for "O, Death" by Ralph Stanley . </P> <P> In 2001, the album spent over 20 weeks on the Billboard Top Country Chart . It won an award for album of the year and "I Am a Man of Constant Sorrow" won an award for single of the year from the Country Music Association . </P>

Who sang for george clooney in o brother where art thou