A collection of some free, legal downloads of dark music I have found.
Oxygenfad - Industrial Rock (I made when I was 16)
Oxygenfad, a.k.a. William Mcleod, is a Canadian artist that mainly makes breakcore and techno (and that's why I never heard of him), but there is one interesting release where he made industrial rock. The sound quality is not the best (not that I care that much about that) and the tracks are perhaps not that polished either, but it gives an interesting insight in what might have happened if his career had not been cut short.