Ken Russell projects the religious frenzy of The Devils and the aesthetic paroxysms of The Music Lovers onto the Who’s rock opera, and the results are somewhere between the apocalypse and Andy Warhol. This 1975 film’s inventiveness begins to flag about halfway through, but by then it’s a relief. If only Wagner could have lived to see this. With Ann-Margret, Oliver Reed, Elton John, and Eric Clapton.