At 3 a.m. on Monday, 18 August 1969, the final night of the Woodstock Music & Art Fair, four men armed only with acoustic guitars faced the gaping darkness of a vast open-air audience. An hour later, Crosby, Stills, Nash and Young had confounded and convinced their peers, and cemented their place in rock history. They had also made themselves, for better or worse, synonymous with Woodstock, and with the nebulous Woodstock generation which it inspired. Between 1969 and 1974, CSNY were the most successful, influential, and politically potent rock band in America. Here, Peter Doggett illuminates the pivotal years of 1960s counterculture through the story of four of its key protagonists, whose music, beliefs and relationships with each other chronicle both its trajectory and its legacy.