lying in bed before falling asleep, he’d heard soundtracks extracted from DNA—strange murmurings transposed from the notorious four-letter alphabet of nucleotides into the twelve pitches of the chromatic scale. But the real art would be to reverse the process, to inscribe a piece for safekeeping into the genetic material of a bacterium. The precise sounds that he inscribed into the living cell were almost immaterial: birdsong, a threnody, the raw noise of this arboretum, music spun from the brain that those self-replicating patterns had led to, four billion years on. Here was the one durable
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