The Oscar-winning actor will star in the Cameron Crowe-directed feature about the singer-songwriter’s life The Oscar-winning actor will star in the Cameron Crowe-directed feature about the singer-songwriter’s life Meryl Streep is to play Joni Mitchell in a forthcoming biopic of the singer-songwriter directed by Cameron Crowe , according to record executive Clive Davis. Davis confirmed the rumours surrounding the casting at his pre-Grammys party on Saturday, reports Rolling Stone. Last year,