Joel and Ethan Coen's 2013 film "Inside Llewyn Davis" is a sombre, cold look at the 1961 New York folk scene, following a starving artist in Greenwich Village, playing at the now famous Gaslight cafe, where Bob Dylan began his rise to fame. The Coen Brothers manage to do more than tell a simple starving artist tale, however, and the central motif of folk music actually serves brilliantly as a metaphor for depression.