Friday night, Lady Gaga enjoyed the surprise addition of fireworks to her show, courtesy of a fortuitously timed barrage from the Bears' family night at Soldier Field directly behind Lollapalooza's main stage in the south end of Hutchinson Field in Chicago's Grant Park. Saturday night, pop-punk trio Green Day brought their own.

In a two-hour-plus set, singer-guitarist Billie Joe Armstrong, bassist Mike Dirnt and drummer Tre Cool filled the stage with good ol' rock 'n' roll stage antics. Here's a band that has actually gone Broadway, creating a stage musical out of their hit concept album, "American Idiot." But instead of loading down their show with scripted theatrics, they relied on the basics -- pyro, fireworks, pulling people on stage and endless exhortations to fans to put their hands in the air.