Katy Perry has long been a fascinating paradox. “I'm capable of anything and everything,” she simultaneously brags and warns on “Dark Horse,” from her fourth and latest album, Prism. Such seemingly limitless pop potential also has been the Santa Barbara singer's curse. The onetime Katy Hudson was already a charismatic performer when she was still a “good” Christian folk singer appearing in local coffeehouses, and she's just as captivating now as a “bad” sex symbol gussied up with slick pop arrangements and decked out in fantastic cupcake costumes. Perry's ongoing dilemma is how to reconcile her serious creative instincts with the artifice and plastic production in which she's often encased, which could be why she's chosen to tour with Tegan and Sara, the thoughtful Canadian duo who balance folk influences with commercial hooks. Also Saturday, Sept. 20.

Fri., Sept. 19, 7:30 p.m.; Sat., Sept. 20, 7:30 p.m., 2014
(Expired: 09/20/14)

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