I own a lot of soundtracks thanks to GOG, and I love them all. I am running a d&d campaign that is about to get into a big creepy castle/dungeon, and I want some moody/tense/scary music. I would prefer track reccomendations from this site, but any will do.

If they are on this site, I can easily access them, and might already own them! Some of the Planescape Torment Tracks are looking promising, Sigil, and Mortuary in particular.