Post your songs that've made you feel sad, and the reason why it did so. Mines would have to be Goodnight Kiss and Through Her Eyes from Dream Theater, they both have a very sad story that's told.
Goodnight Kiss:
[media]http://www.youtube.com/watch?v=H56m8CYdov0[/media]
Through Her Eyes:
[media]http://www.youtube.com/watch?v=SjINXbJ3vdo[/media]