Question: who sang for george clooney in o brother where art thou
Answer: 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 .