The failure of any filmmaker to produce Alan Greenberg’s screenplay, Love in Vain, seems almost as mysterious as the life of its subject, Robert Johnson. Mick Jagger took a hand in this exploration of the great bluesman as far back as the late-‘70s and Greenberg acknowledges the interest of many other familiar names, among them Bob Dylan, David Lynch, Werner Herzog and Prince. Martin Scorsese wrote the forward to the second published edition, but that was 1994.

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