It’s been nearly two years since Katy Perry — one of several modern musical supernovae reflected in the beautiful, shattered-glass surfaces of “Vox Lux” — launched the campaign for her fifth album by declaring a new era of “purposeful pop.” No longer would her catchy-as-chlamydia radio anthems be mere teenage dreams of kissing California gurls last Friday night, apparently. Perry’s pop would show invigorated social and political resolve, leaving a woker, sparklier world in its wake. “I’ve seen behind the curtain, and I can’t go back,” Perry said, setting herself up for a media drubbing when the album, give or take some standard-issue empowerment mantras, sounded much like all its slickly enamelled predecessors
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