This doesn't really seem like something I'd post, so, whatever. I'm reviving oranberrysanvich's thread with the same name. Just post songs and author(s) of that songs that make you cry, albeit out of happiness of sadness. Also, if you can, tell us why. I'll start.
Lucy - Skillet
It's about someone's love dying. If this isn't sad to you, you are heartless.
*Bursts into tears*
So, next!