I'm a big anime fan, and Duvet by BoA is a song that I like to listen to when I'm feeling down, it's melancholy but somehow calming.
For those who are unfamiliar, it's the song used in the opening for the anime Serial Experiments Lain, which is about a girl who goes from receiving her first ever computer to becoming a superhacker and eventually achieving the singularity and becoming a goddess of the Internet. It's really interesting.
If you listen to the lyrics to either Duvet or Duvet Cyberia Remix (a soft electronica remix that I prefer more over the original), it doesn't sound like it has anything to do with the premise of Lain, but that's how I first heard of it. I listen to it a lot when dealing with loss (either death of a friend or breaking up with a love interest, etc.) Even though the song is melancholic and sad, it has a carthatic effect on my own sadness, and after about 2-3 loops of it I usually feel better. Not necessarily happy, but at least at peace.
[youtube]http://www.youtube.com/watch?v=wopf857OUiI[/youtube]
[youtube]http://www.youtube.com/watch?v=juDqDMlTfUg[/youtube]
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