There are fantastic concerts, which are extremely simple and low key, and about nothing but an intimate performance (think: Adele, at the RAH), and then.... there are concerts like this one (also fantastic), that seem more like a non-stop, three-ring circus.
Her music is already infectious, and often energetic, in only its audio form. With only a slight respite in the middle (for some of her more quiet, personal songs), this concert (or maybe a better description would be "event") seems to perfectly translate the energy of her music to the stage.
The concert utilizes a huge stage, which extends forward, well into the audience, and Katy, along with an ensemble of fellow performers, continuously utilize all of it, bouncing, dancing, and in general keeping everyone engaged visually, as much as musically. It's easy to imagine her losing a few pounds, in the course of the show, just from the (almost) continuous workout.
The thing is, it's all super engaging. The songs already suck you in for the "catchy, chorus, sing-along's" (as the audience does, throughout the whole show), and there is a continuous feast for the eyes. But as well as the sing along, it absolutely makes you want to stand up, and bounce/dance right along with her and her troop of performers. (She is so energetic at times, that it almost makes you feel guilty, and a bit lazy, if you don't get up and dance along.) And, of course, as in her past concerts, Katy undergoes something like a half dozen complete wardrobe and hair changes, all to fit in with a similar number of complete theme changes in the staging of the performance. She does everything from jump rope, to fly around the auditorium, during the course of the performance, while belting out one top ten hit, after another.
This is a highly enjoyable, and highly recommended, two hours of addictive fun.
For the record, the performance consists of these songs (in this order): Roar, Part of Me, Wide Awake, This Moment, Love Me, Dark Horse, E.T., Legendary Lovers, I Kissed A Girl, Hot N Cold, International Smile, (A snippet of Madonna's "Vogue", slipped in here for good measure), By The Grace Of God, The One That Got Away, Unconditionally, Walking on Air, It Takes Two, This Is How We Do, Last Friday Night, Teenage Dream, California Gurls, Birthday, Firework