On the A-side, "Mu5h" states its theme through liquid-sounding tremolo, like a Leslie organ remade for the dubstep age; it's joined over its four minutes by another, more gaseous-sounding keyboard percolating behind it. But the real atom bomb is the B. "Spliff Dub (Rustie Remix)" reinvents the glowering original — a fairly simple track with heavy low end and a trilling flute line — into a jagged hunk of digital-futuristic bubblegum that splits its source material into tiny pieces that waits for a minute and a half to lay you flat with big, bright synth pads that throw the entire record into naked sunlight.