Donna Summer Photo: Peter MuhldorferIn addition to the disco rhythms, glitzy fashions and alarming hairstyles, “Love to Love You, Donna Summer ” might strike a nostalgic nerve with how natural, funny and forthcoming its subject is. Even at the height of her career, as the “Love to Love You” sex-dance-club diva of the ’70s, Donna Summer was funny, clever and off-the-cuff. And what happened to her later might help explain why celebrities of today are so suffocatingly scripted.

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