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George Clooney

The handsome George Clooney is known for his fancy suits, but in 2000 he pulled on some dirty overalls to play one of a trio of guys living in the Great Depression-era rural South for the Coen brothers' movie "O Brother, Where Art Thou?" The film, which is loosely based on the epic poem "Odysseus," follows them as they break away from prison and, among other adventures, record the song "I Am a Man of Constant Sorrow" as the Soggy Bottom Boys. The movie's soundtrack sold more than nine million copies and made bluegrass and folk music cool again. But while Clooney, 51, is a talented actor, with an Oscar from 2005's "Syriana" to prove it, he left the "O Brother" vocals to professional musicians. His voice, as well as that of the rest of the cast, was dubbed. Although, legendary musician T-Bone Burnett, who worked on the film's music, said Clooney's voice was impressive for someone who doesn't sing for a living. "Just for the record, George Clooney is a very good singer ... [but recording that song] is not something one can do overnight, not even George Clooney," Burnett said on the 10th anniversary reissue of the album.

Buy "O Brother, Where Art Thou?" on DVD

Celebs Go Country for Movie Roles

Stars from Reese Witherspoon to Jeff Bridges have said "yee-haw" to playing country music singers in movies.