Looking for depressing, sad, slow music?

I have to make a video for school, so I'm looking for some music that makes you feel depressed just listening to it. I was thinking about Mad World by Gary Jules but since I don't know alot of music I was hoping some people with a wider array of taste could help me out. Any ideas at all are greatly appreciated. If you could name off 5 or 10, even more so :) Thanks in advance.