Martha Marcy May Marlene is in select theaters now, and will expand this weekend, as the drama from director T. Sean Durkin garners huge buzz heading into the awards season. Elizabeth Olsen stars as a young woman that escapes an extremist cult to reunite with her sister. We have co-star John Hawkes singing the theme song, which was written by folk artist Jackson C. Frank. Check out the Marcy's Song music video in the clip below.