At the intersection of relaxation and horror lies "The Ossuary". Part 1: A Beginning
This piece is a slow-moving edgy drone with an ethereal melody on top. Since this is sort of a new genre, I'm not exactly sure where it is appropriate. Maybe a vampire spa? Dinner music for a psychopath? You'll figure it out!
This includes one file in high quality: Ossuary 1 - A Beginning.wav