Hyde Park Happening

29th June 1968: A crowd of young hippies watching British folk-rock group Jethro Tull at the first pop concert to be held in Hyde Park, London, on the banks of Lake Serpentine. (Photo by Bob Aylott/Keystone/Getty Images)

29th June 1968: A crowd of young hippies watching British folk-rock group Jethro Tull at the first pop concert to be held in Hyde Park, London, on the banks of Lake Serpentine. (Photo by Bob Aylott/Keystone/Getty Images)