C., Spears temporarily shut down all the flash and spectacle and performed a cover of Alanis Morissette's "You Oughta Know." More so than at any other time during the two-hour concert, Spears appeared to be actually singing, and her faithful rendition of "You Oughta Know" provided a refreshing realism to the set. Having largely surprised the Tulsa crowd with the Morissette song, Spears returned to massive dance sequences with a Bollywood-inspired performance of "Me Against the Music." And after emphasizing her more sexualized material such as "Freakshow," "Breathe On Me" and "Get Naked," she closed out her main set with two of her best-known hits, "Toxic" and "Baby One More Time." There would be no massive encore: Spears performed "Womanizer" before she and her dancers bowed and exited to the strains of "Circus." Call it an expectations game or grading on a curve, but for a good portion of this decade, Spears did little to inspire confidence that she could put on such a show. At this point, she is far from embarrassing herself or going through the motions as she did during that memorably shambling performance on the MTV Video Music Awards just two years ago. She looked good, was energetic and proved fully capable of being the ringmaster for this "Circus." And for the approximately 16,000 fans gathered in downtown Tulsa, that was more than enough.