'O Brother, Where Art Thou?' (2000)
Credit for this proto-Mumford & Sons old-time-music revival salvo goes not just to the soundtrack-savvy Coen brothers (see also The Big Lebowski and Inside Llewyn Davis), but also T Bone Burnett: it’s one of his greatest moments as an album producer. With lean accompaniment, Alison Krauss makes her most high-profile bid for title of Country Music's Sweetest Voice, alongside fellow contenders Emmylou Harris and Gillian Welch. But the show-stealer is bluegrass pater familias Ralph Stanley, whose a cappella rendition of the spiritual "O Death" is downright bone-chilling.