Rock music legend Janis Joplin performs at the free Woodstock Music and Art Fair. The festival took place on Max Yasgur's dairy farm, which he rented to event organizers for $75,000. About 450,000 people attended the three day concert, which turned into chaos due to the crowds, heavy rains, and traffic jams. It is nonetheless romantically remembered as a symbol of the liberal spirit of the hippie generation. (Photo by Henry Diltz/Corbis via Getty Images)