9. "Gimme Shelter" (1970)

While chronicling the Rolling Stones' free 1969 concert at Altamont Speedway, directors Albert and David Maysles ended up capturing the killing blow to Summer of Love innocence (the Manson family took the first whack a few months before). Their footage of Meredith Hunter aiming a gun at Mick Jagger also led to the acquittal of his killer, Hell's Angel Alan Passaro.