moon landing, the manson murders shook us to our core and a week after that, the counterculture threw itself the biggest party anyone had ever attended. >> so woodstock was somethingsted in what was happening on the moon. >> i had a ticket. i was dissuaded by well meaning people who thought i wouldn't survive. >> reporter: woodstock was peace and love, music and mud, rebellion and rain. >> i thought at the time, this sucks. >> i was standing on the stage at a certain point with chip monk who is that famous voice of woodstock. the guy you hearsaying the brown acid is not that good. >> it's just bad acid. >> reporter: that moment, with the iconic woodstock documentary shaped the way it would be remembered. john sebastian was there as a spectator. he was summoned to the stage. >> i don't know how it is done with half a million people, but i just remember man, when i started singing and i might have had some oh jesus, this is crazy kind of thoughts but really, by then, i'm concentrating on the job. so i'm tuning on the way up the stairs. and they announce me and i go on. ience all of dsus had had enormous amounts of experience playing for those crowds of wow, 200. man