Dan Frampton, a.k.a. Dusk , and Pitchfork contributor Martin Clark, a.k.a. Blackdown , have been churning out solid 12" singles for a minute. On first listen, the obvious thing to say is that this London-based production team's debut, Margins Music , is for fans of a Burial-style approach. But it's really much less moody than this, though, and the 2-step feel of "Focus" is an example of