I really like to use the Bioshock computer game soundtracks as Garry Schyman beautifully weaves some period jazz (slightly too late - 1930s+) with avant garde orchestral horror.

Another vote for Lustmord here too!

I use the Quake soundtrack all the time for dark ambient music while reading or RPG's that it fits with. Cthulhu tabletop RPG's and board games being one of them. Reznor knocked this out of the park. Even the slight electronic elements just fit. The first minute of the first track is a little fast and beaty, but the rest of the album just oozes great dark ambience. I bought the original quake when it released in 1996, but I'm sure it can be found easily online (the game with the redbook audio). There just isn't a better creepy atmospheric sound track than this one. It doesn't exist.

I also love the Diablo soundtrack for great ambient music. There's some great stuff, I specifically like the 15 year anthology as a good mix of stuff. There's some really creepy tracks in there, use this as much as the quake soundtrack, but quake will always by my #1. It's just brilliant.. but.. anyway.. here's Diablo.. The first track is a little "movieish - marchish" but there's so many good ones after that.. I think i got this as a bonus for a collectors edition or something , sure it can probably be found online as well.. Start it up at 9:29 and just let it rip..

And just for giggles, the complete (with Lord of Destrcution) Diablo II soundtrack

Just registered to say that I love using music composed by Christopher Young, I don't think anyone has mentioned him yet. Check out the Hellraiser Score: https://www.youtube.com/watch?v=o1Z-tQDHprE

Used to play the Cthulhu RPG like 20 years ago, and the GM had the CD, and the music has stuck with me ever since for gaming purposes. Just look up Christopher Young on Spotify, lots of decent music for horror games.

One of the creepiest (and while playing, not too intrusive) soundtracks is the one for Kubrick's 'The Shining.'

https://www.youtube.com/watch?v=Qo7Ma768faY


Being a fan of seventies\ eighties Itallian horror films I also like Goblin quite a bit. This one for instance:

Hi folks!

Once more suggestion from me which I've been enjoying lately: The soundtrack to Penny Dreadfull (it's on Spotify if you're curious). (And as a side note, just how good is Season 2!?)

If I did listen to soundtracks while playing (which I just must try), I would stick with orchestral movie soundtracks: "The Island of Dr, Moreau", "Bram Stoker's Dracula", "The Ninth Gate", "The Devil's Advocate", "Sleepy Hollow".

Wow, very good soundtracks over here.

I have found 2 playlists on Spotify that I have been enjoying a lot. Hopefully you will enjoy too.

This one has lots of instrumental soundtracks.

The other one was created by a brazilian user, Lucas Andrade, from Eldritch Horror community on Facebook.

my 2 cents