He didn't reply. Instead he opened one of the enhanced files, this one from a bootleg that had never been commercially released. A tenor rose in the second verse that the original tape didn't contain; it was lush enough to carry a chorus. Tom recognized, impossibly, a cadence and a phrasing from a session musician who'd played with the singer in 1998. The digital extra held a signature he could almost place. He scrolled through the algorithm's logs and found a line of text he had not noticed earlier: patch references, model hashes, and something labeled "seed provenance." Beneath it, a string of metadata looked like a URL to a private corpus: an internal path to a studio's archived stems.

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