Yeah, evangelikk, it says at the very end of the video: Soundtrack: 'My Ship' by Thermostatic I don't know what it's "from" but that's what it is at least.
I've played the "Penumbra: Black Plague", it's really not bad at all, although (as shown in the vid above) the graphic is seriously outdated, but the game interface is surprisingly useful and well-thought. Quite good in building up tension and anxiety, both with music and layout of the game. I would recommend it if you're out for a distraction from the usual style of games and do not take graphics as a major deciding factor for a game. To put it mildly, a good story-telling thriller.