Sad songs to listen to?

So I would like to know some sad songs that are emotional and meaningful. I have asked a question like this before and two songs I got that I really liked were Mad World by Gary Jules, and Forever by Stratovarius. Also, I like Evanescence and stuff like that :). What are songs that YOU listen to when you are sad? Or songs that make you think, or even cry! Please tell them to me with the title and artist :) THANKS :D