Carly Rae Jepsen's "Call Me Maybe" is the gift that never stops giving. The pop song of summer 2012 — which became the clear pop song of the year and a frontrunner for pop song of the decade (its competition is shaping up to be "Hotline Bling" and a veritable Taylor Swift compilation) — gave us so much already: that adorable living-room karaoke tribute staged by varsity pop stars Selena Gomez and Justin Bieber; all those awkward talk-show love-ins, culminating with Colin Powell and Gayle King's Geneva Convention-violating duet on CBS This Morning; and the considerably catchier "cover" stitched out of Barack Obama speeches. It also can be credited with facilitating Jepsen's 2015 follow-up Emotion (Interscope), a collection of hairbrush-in-the-mirror moments writ large that whiffed commercially but expanded her fan base exponentially, likely doubling its median age in the process. (Jepsen, it should be said and then immediately forgotten, turned 32 this year.) By extension, it now is providing a bona fide excuse for any non-chaperones to attend a Katy Perry concert, aside from maybe eating some questionable mushrooms ("LA Hallucinations"?) and hoping for the magic of her Super Bowl-halftime shark attack to come flashing back. Tickets $26-$177 plus fees. Jan. 5, 7:30 p.m. Friday; Smoothie King Center, 1501 Dave Dixon Drive, (504) 587-3822; www.smoothiekingcenter.com.