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Plot: Since her '70s heyday as disco's reigning diva (and one of its most adventurous artists), Donna Summer has scored the odd hit: "She Works Hard for the Money," "This Time I Know It's for Real. " She's still best remembered for the likes of "Last Dance," "Dim All the Lights," and "I Feel Love," though, and this VH1-tie-in comeback bid concentrates on full-bodied if somewhat murkily mixed versions of those classics and their kin