Her first set of the night was, as expected, a rendition of "Roar," her eighth No. 1 single on the Hot 100. By Kevin Rutherford, Billboard Crocodiles and elephants and giraffes, oh my! Katy Perry ...

Many of us love the slew of bops that Katy Perry put out in the early 2000s, like "Hot N Cold," "California Gurls," and, of course, "Roar." Since then, the "American Idol" judge has continued churning ...