Like many of the songs on ASAP Rocky’s new album Testing, “Hun43rd” is constructed from the remnants of a mangled sample. The choice of found material feels particularly tricky here, though. Using a sample of Tupac and Thug Life’s iconic “Cradle to Grave,” the Dev Hynes-produced beat modifies and chops up the sampled chorus so that it resembles a ghostly procession of voices bubbling up from the underworld. It’s all swaddled in thick hits of percussion, Hynes’ own sweet background coos, and frigid synthesizer chords, making for a listening experience that feels as haunting and exhilarating as a sprint through a graveyard at night. Rocky enters this scene like a soothsayer, his voice feeling supernatural, mutating every few bars, keeping the listener on unsteady ground throughout. It seems Rocky’s goal on Testing is to make music that relates the shock of the new, and on “Hun43rd” that ambition is met.