Breaking out of the 70s New York punk scene, Patti Smith was a revelation: a musician of searing originality, but also an intellectual, a style icon and an incomparable live performer. Her career since has been marked by extraordinary achievement, incendiary creative collaborations, and shocking tragedies. Stephen Sebring's documentary portrait covers the hard times and the triumphs as well as the challenges of peeing into a plastic bottle whilst travelling on a private jet…