Have you ever heard the story behind The Who's "Tommy" or Deep Purple's "Smoke on the Water"? Did you know that Caroline of "Sweet Caroline" was actually a young Caroline Kennedy? Or that Michael Jackson wrote "Billie Jean" while (allegedly) driving a car that was on fire?

This week on Mental Floss, the musical group The Gregory Brothers (perhaps best known as the people responsible for Schmoyoho and Auto-Tune the News) outline the stories behind 33 famous songs. I didn't know half of this stuff.