I give you a list of tracks that are somehow related.
I listen to:
tracks without lyrics
gopher://uninformativ.de/1/music/Elektronische-Musik/ — n-to-infty (Gopher URL):
[ul][li]gopher://uninformativ.de/s/music/Elektronische-Musik/n-to-infty%20-%20Arbeitstag.ogg — Arbeitstag (Gopher URL) (Very dark atmosphere and somehow industrial, too (hence the name “Arbeitstag” (=German word for “work day”)))[/li][/ul]
The other tracks are nice, too but they clearly don’t fit into the “dark”/“horror” theme. And they aren’t ambient at all.
Shawn Parkle:
[ul][li]Horror and Suspense: atmospheric tracks that serve well as a background ambience, but they are brighter (“less dark”) than “Arbeitstag”[/li][/ul]
Starpilot:
[ul][li]Butcher Knife Syndrome: crazy chiptune madness. You have been warned! [/li][/ul]
tracks with English Lyrics
Viton & Stel:
[ul][li]Nightmare[/li][/ul]
Techno. This is the only track I know from them. On the Internet there are probably lots of copies of it. I bet you’ll find it yourself.
Professor Shyguy:
[ul][li]Zombies > Vampires: This track is not atmospheric at all, I added it just for fun. As the title suggest, this track explains why zombies are greater than vampires ;-)[/li][/ul]
tracks with German Lyrics
Das Schwarze System
[ul][li]Blinder Passagier[/li]
[li]Deine Seele[/li][/ul]
This is electro. And dark.
all:my:faults:
[ul][li]Gesenkte Augen//Geschlossenes Haupt[/li][/ul]
Metal. all:my:faults have some lyrics in English, too. So check out their Jamendo page.
This list is non-exhaustive. 
I just listed the most notable tracks. Especially I omitted a lot of tracks of several artists. So if you liked one track, you probably like the other tracks of the same artist, too.
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Note: To access “gopher://” URLs, you need a software that knows the Gopher protocol. Gopher is something like the WWW, but much, much older. The main difference is probably that Gopher allows to sort the files in a hierachy, unlike in the WWW, where the website navigation/file hierarchy has to be part of the webpage itself. More infos on Gopher: Wikipedia on Gopher (protocol). If you use Firefox, I recommend OverbiteFF <[iurl=https://addons.mozilla.org/en-US/firefox/addon/overbiteff/]https://addons.mozilla.org/en-US/firefox/addon/overbiteff/[/iurl]>, an extension that adds Gopher support to Firefox. The track “Arbeitstag” by “n-to-infty” is only accessible via Gopher AFAIK.
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I would like to know some more ambient tracks with a “spooky” ambient. Sadly I do not know a lot of them. Something similar to Shawn Parkle’s tracks would be cool to know but also “Arbeitstag” goes into that direction. I didn’t check out the tracks of this thread out yet, so sorry if this is a stupid request. If I checked the other tracks out, I report back.
Edit: I had to edit this posting because the fucking stupid forum software destroyed my Gopher URLs -_-
