Hmm, mine would have to be this.
Green River Ordinance - Endlessly
I think it's a beautiful song in it's own right, but as a song I sang (badly!) to win my now ex girlfriend's heart so to speak (sounds corny I know)
it also has a lot of sentimental value to me.
I don't know, they could be huge over there in the US/Canada for all I know, but they most certainly aren't here in the UK as of yet.
edit on 14-1-2011 by Trapt because: (no reason given)