Science proves it!
KATY PERRY has a song - BIRTHDAY - which is SCIENTIFICALLY PROVEN to make YOU happy!
So, turn this on, feel the love and know that it's all good. You're supposed to feel happy and such when this comes on. Because science... says so!
You'll note on this list are songs which make you feel some sorta way... from COLDPLAY to PHARRELL WILLIAMS!
It's good stuff. Feel it out.