The best soundtracks are like movies for the ears, and "O Brother, Where Art Thou?" joins the likes of "Saturday Night Fever" and "The Harder They Come" as cinematic pinnacles of song. The music from the Coen brothers' Depression-era film taps into the source from which the purest strains of country, blues, bluegrass, folk, and gospel music flow. Producer T Bone Burnett enlists the voices of Alison Krauss, Gillian Welch, Emmylou Harris, Ralph Stanley, and kindred spirits for performances of traditional material, in arrangements that are either a cappella or feature bare-bones accompaniment. Highlights range from the aching purity of Krauss's "Down to the River to Pray" to the plainspoken faith of the Whites' "Keep on the Sunny Side" to Stanley's chillingly plaintive "O Death." The album's spiritual centerpiece finds Krauss, Welch, and Harris harmonizing on "Didn't Leave Nobody but the Baby," a gospel lullaby that sounds like a chorus of Appalachian angels. "--Don McLeese"