Not many middle school dances in the early aughts could have happened if not for these pop music compilations. In the days of Napster's dominance, you couldn't just make a Spotify playlist of all the tightest cuts you heard on the school bus, and buying CDs just for one song put a lot of good allowance to waste. Luckily, Now, That's What I Call Music rolled onto the scene. Salute the franchise that allowed us to get our Nelly and Good Charlotte on the same album and held us over until we learned how to burn our own CDs.