Fans are rallying to liberate the singer from her father’s control. But emancipation narratives from Mariah Carey and other pop stars show how complex independence can be.Someday, with luck, Britney Spears will write a “good, mysterious book.” At least, that’s what she said in the closing moments of Britney: For the Record, a 2008 MTV special that capped off a few years of highly publicized turmoils for Spears: paparazzi skirmishes, child-custody battles, lethargic performances, an involuntary psychiatric visit, and one infamous head shaving. The documentary captured the singer’s attempt to move on from her scandals, but at the end of its hour-long running time, an interviewer noted that Spears had still discussed her problems in only vague terms. With a wistful smile and tilt of her head, Spears assured viewers that she’d eventually put all her answers in writing.