The concert film “Woodstock,” made in 1970 by director Michael Wadleigh, captured the August 1969 “three days of peace and love” music festival in Bethel, New York, the touchstone for a generation and the height of the anti-Vietnam War movement. Joe Cocker, Joan Baez, The Who, Santana and Jimi Hendrix were among the notables who took to that muddy, rainy stage, which Wadleigh’s cameramen and editors, including a young Martin Scorsese, weaved together into a