Holowach was one of the first musicians I discovered (back in 2005) who believed in sharing his work for free online. He created his music from almost entirely samples, and licensed under creative commons. For a student filmmaker looking for dark ambient soundtracks, this was a goldmine.
I put some of his best work together into a two hour continuous mix. There are no vocals, till the later part of the mix, except for a few sparse samples. Perfect for reading, studying, or just day dreaming off into another world.
Free albums by John Holowach:
Earlier work is a bit darker, and later work is more hopeful. They are all good.
Free albums by Tryad: