This fascinating documentary chronicles the Vienna Philharmonic's standard-setting 1964 production of Wagner's great opus, directed by Georg Solti and featuring Wolfgang Windgassen and Birgit Nilsson in the starring roles. Interviews with Solti, producer John Culshaw and others, along with historic footage of rehearsals, offer a rare glimpse behind the curtain to see the inner workings of one of the greatest opera productions of all time.