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The depressed mood, robotic dance moves and black clothes channel Janet Jackson and “Rhythm Nation” as well as Metropolis, the 1927 German sci-fi by Fritz Lang. That’s the thing about Gaga and her references: so many pop cultural references get scrambled into a single shot that she’s not “ripping off Madonna,” as so many other bloggers will say. She’s doing Ace of Base doing Madonna doing Janet Jackson doing Metropolis doing a gay porn film.