Well, The artists you've listed above, make some sad songs every now, and again....but you already know this because you have them listed yourself (with exception of the song titles). Therefore, it would be kinda pointless to go in that direction. If you want something very powerful...emotionally driven material, to make you sad, or even make you cry (if you're thinking of becoming an actor) I suggest listening to some movie scores. Or soundtracks that you're familiar with. For example Gladiator: The Soundtrack, Titantic: The Soundtrack, or Requiem for A Dream : The Soundtrack, etc.
My favorites are these scores conducted by Hans Zimmer
Batman Begins' "Tadarida":
I know great music that can trigger your emotions!