Over the last several weeks, we have been rolling out new music made by some amazing folks to accompany bonus footage from “The Cold Lands,” which stars Lili Taylor and is now available on most video-on-demand services. It started with Mark Mulcahy, then the first new music from Michael Stipe since R.E.M. called it a day, and many other great musicians.Here’s the latest, with Dub Gabriel, and our conversation with the dubstep pioneer.And if you are in San Francisco, go see it tonight (July 16) at 7 p.m.