When Janet Jackson was 17, she did what people told her—but her subsequent wresting of creative control led to one of the most spectacular discographies in pop. Her slip of a soprano belies the very real power at her core, a determination to fully be herself that has led to her embracing “The Pleasure Principle” on high-energy dance tracks like “If” and ultra-sensual slow jams like “Come Back to Me.” She also reminds us of life's bigger picture with slamming tracks like “Rhythm Nation."