It sounds like a punch line: "There's a new Grateful Dead documentary – and it's four hours long." But Long Strange Trip, directed by Amir Bar-Lev (The Tillman Story, Happy Valley) and executive-produced by Martin Scorsese, is no amiably noodling shuffle through a defunct band's yellowed back pages.
This article originally appeared on www.rollingstone.com: Epic Grateful Dead Doc ‘Long Strange Trip’: 10 Things We Learned