Book excerpt: For more than three decades, Joel and Ethan Coen have produced some of the most memorable and influential American roots music soundtracks in film history. From Raising Arizona (1987) to O Brother, Where Art Thou? (2000) to Inside Llewyn Davis (2013), the Coens, along with musical archivist and producer T-Bone Burnett, have curated half-forgotten yet unforgettable genres, artists and songs from America's cultural past for new audiences. This book is the first devoted to giving a full account of this rich cinematic legacy.