I found a pretty good free resource for Haunt-worthy streaming sounds at Soma FM. Check out the last channel Doomed. It is a great ongoing mix of dark ambient, I think it would make great background music for a haunt or Halloween party. There don't seem to be the silly warbling ghost sounds or bad vampire accents, just dark, dark ambient. The last song I heard was like walking through a swamp at midnight. I use Winamp and the 128k link with great results on a crappy old computer. I am in no way associated with them, but have been enjoying them for a couple of years now, they have several other cool channels including a really good Christmas one even though I typically can't stand X-mas music.