The final set of the day belonged to Katy Perry, an anomaly on this tour for several reasons: She is a woman; she is a pop singer; and she has a song, I Kissed a Girl, which has spent the last month atop the Billboard singles chart. But in spite of a teal top and matching shorts, and perfect hair, she played to the scene, rolling around the stage like a rock star, and leading her band in heavier, more guitar-driven arrangements of her songs. By the time she closed with her big hit, boys were singing along, and dozens of girls were crowd-surfing. On this day it was not the least punk thing to have happened.



