A young Martin Scorsese pitched in on the editing (beginning what would become a longtime collaboration with lead editor Thelma Schoonmaker) for this influential music documentary on the landmark Woodstock event. While its selection into the National Film Registry may have more to do with the way it captures a sixties counterculture at the height of its free-spirit, anything-goes mystique, it’s also a staggering document of genius musical performances by artists including Jimi Hendrix, The Who, Country Joe and the Fish, Janis Joplin, Crosby, Stills & Nash, and Sly and the Family Stone, among many others.