You would omit bubblegum pop anthems like Last Friday Night, California Gurls, Teenage Dream, Waking Up in Vegas, I Kissed a Girl, and on and on. Most of her co-writes are with Max Martin (King of boy/girl band pop) and Dr. Luke (the prince).

She always throws in a "serious" song or two per album. Britney, Christina, and even P!nk do the same. Doesn't stop them from being very good (even great) disposable pop. I love a lot of their music, but it's very bubblegummy to me!