Whether you like this album or not, it is destined to be a pop music landmark. Katy Perry has emerged with commercial success that allows her to be mentioned in the same breath with Lady Gaga and Rihanna while battling with Eminem for the title of top pop star of summer 2010. "California Gurls" looks destined to be one of the top 10 hits of the year, "Teenage Dream" looks likely to follow it to #1.