This is frightening, and amazing. Mumdance never disappoints, but this feels like the future. And not just “the future of dance music.” I’m not even sure if you can dance to this. You could, but are DJs dropping this in the club to get crowds to bust-a-move, or to truly marvel at their lives? Right off the bat, “The Sprawl” (which is due out on June 16) sounds to me like the T-1000 doing a live remix of Herbie Hancock’s “Rockit.” And that’s a great thing. Aside from “electronic music,” what genre do you even put “The Sprawl” into? And does it even matter? This is just an epic experience. So heavy.