in the Swedish language — VEMOD. When you look it up in a dicitionary they give «sadness, melancholy» but there’s more to it. I think you have to stir in a great deal of nostalgia into the mix, in order to get the full gist of it.
I can think of almost no other song [well, maybe the theme from Deerhunter, Cavatina], that really tells you what «vemod» feels like … Please, take a listen!
I keep forgetting about WP and the Flash issue, so unfortunately you’ll have to click on the link — couldn’t find it on YouTube.