A question of strong simplicity, and desiring an answer of sheer simplicity as well, but, what is the song that you listen to whenever you're sad? I used to listen to Hurt by Nine Inch Nails and My Guardian Angel by Red Jumpsuit Apparatus back to back, but I've been shifting more toward Be Calm by Fun and things like that over the last month or so. They're kind-of a less depression form of sad, I guess.