The Coen brothers’ latest film is a folk music odyssey set in the early ’60s New York scene. It’s called Inside Llewyn Davis, stars Oscar Isaac, Justin Timberlake, Carey Mulligan and John Goodman, and opens in New York and Los Angeles this weekend ahead of its wide national release. Here, we speak with Isaac about playing an unsympathetic character, live music on set, and what his feline co-star thought of working with him.