"Even in the larger-than-life world of rock and roll, it was hard to imagine four more different men. David Crosby, the opinionated hippie guru. Stephen Stills, the perpetually driven musician. Graham Nash, the tactful pop craftsman. Neil Young, the creatively restless loner. But together, few groups were as in sync with their times as Crosby, Stills, Nash and Young. Starting with the original trio's landmark 1969 debut album, the group embodied much...

For three days in the summer of 1969, a rock concert was held on an upstate New York farm, and 400,000 people attended -- far more than were anticipated, far more than paid, far more than could be fed or sheltered or cared for after injuries or drug overdoses. It rained, there was mud, all traffic in and out was gridlocked, and the music continued, night and day. "Woodstock Nation" existed for three days and was absorbed into American myth. As depicted...