Ever since I was in high school, my workout playlist has been filled with emo music. Sure, I like to break a sweat to pop and hip-hop, too, but there's nothing like the angsty music from my teen years ...

The 2000s had many things (questionable fashion trends! The best Disney Channel Original movies!), but top-tier pop music is what really defines this era in our minds. And if you're ready to take a ...