Not content with that, just two years later he bashed out arguably the greatest concert movie. Actually, scrap ‘arguably’ – Sign O’ The Times’ recent IMAX upgrade seals that deal. There we were, watching a 38-year-old concert movie, its star long gone, now, but you wouldn’t have known it. Sign O’ The Times is the world’s most hormonal concert movie. For the entirety of the thing, Prince is on heat (as was invariably the case throughout his life, to be fair).