There's a sense in which a label like Mike Paradinas's Planet Mu, which makes its bread and butter with freewheeling IDM, shouldn't be putting out dubstep compilations this masterful, but in music there are no rules, only results. Of course, when you tap the likes of Distance, Benga, and Pinch — three of the field's smartest producers — to fill out your genre survey, results are pretty much guaranteed. Standouts include Pinch's opening "Qawwali," which floats on a tinny accordion phrase, Vex'd's "Fire" (spooky violins stretching out the wait for the beat to drop till you're almost lulled into thinking otherwise — nope), and the hazy fields of thick air surrounding the distorted percussion clanks of Boxcutter's "Bad You Do (Halfstep)."