WThe crowd gathered outside Fenway Park is buzzing, just as you’d expect on an early spring night in Boston. But there’s not a Big Papi jersey in sight. Instead, the line snaking along the block is for Katy Perry’s concert at the House of Blues. The child of pastors and one-time gospel-rocker has parlayed infectious fruit-flavored hits like “I Kissed a Girl” and “Hot and Cold” into a sold-out 50-city concert tour. And somewhere along the way, her career became a blueprint for aspiring pop stars.















































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