Krauss had her only number one hit in 2000, receiving vocal credit for "Buy Me a Rose." She has contributed to numerous motion picture soundtracks, most notably "O Brother, Where Art Thou?" (2000). She and Dan Tyminski contributed multiple tracks, including "I'll Fly Away" (with Gillian Welch), "Down to the River to Pray", and "I Am a Man of Constant Sorrow". In the film, Tyminski's vocals on "I Am a Man of Constant Sorrow" were used for George Clooney's character. The soundtrack sold over seven million copies and won the Grammy for Album of the Year in 2002. Both Krauss and the surprisingly popular album were credited with reviving interest in bluegrass. She has said, however, that she believes Americans already liked bluegrass and other less-heard musical genres, and that the film merely provided easy exposure to the music. She did not appear in the movie, at her own request, because she was pregnant during its filming.