Five hundred thousand young Americans did their own thing at the Woodstock music festival in nineteen sixty-nine.They gathered at a farm in New York state. They listened to musicians such as Jimi Hendrix and Joan Baez, and to groups like The Who and Jefferson Airplane.Woodstock became a symbol of the young peoples' rebellion against traditional values.Many young people called themselves "hippies." Hippies believed there should be more love and personal freedom in America.In nineteen sixty-seven, poet Allen Ginsberg helped lead a gathering of hippies in San Francisco.No one knows exactly how many people considered themselves hippies. But twenty thousand attended the gathering.Another leader of the event was Timothy Leary."Now, energy comes ..."He was a former university professor and researcher. Leary urged the crowd in San Francisco to "tune in and drop out".