Beyond 'Llewyn Davis:' A fond look back at early-'60s New York from those who were there

In the Coen brothers' movie " Inside Llewyn Davis ," Oscar Isaac plays a folk singer barely making a living in Greenwich Village in the early '60s, sleeping on the couches of downtown friends, presumably unaware of a singer from Hibbing, Minn ., who has just hit town and will change the world - but not quite yet.

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