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The first one that came to mind was Disturbed - Darkness...
I'm sure there are others, but they don't come to mind right now.
Another though was a song I "wrote" for my sister before she left for Peru. I put "wrote" in quotation marks because I never finished writing it. I wrote most of the music and the chorus lyrics, but didn't really get much more than that. I played it a few times and teared up a little bit. I always had a tough time playing the ending riffs because, well, I didn't want the song to end... but I knew it had to.
She came home less than a year later, so... moot point, I guess?