Howdy. I think I've got the answer. I've written an audio fingerprinting algorithm to search the Phish archive (every song in "the spreadsheet"). Since it's cheating, I won't post the answer or try to claim the prize. But just for proof, I can post a hash (SHA-256) of the text of my answer (75b31641cc7977048378c8f47fee8b19c6473f15b9b8a905d65fea57d957f307). If anyone cares if I'm lying or thinks this is interesting, that can verify my answer later.

I've been experimenting with audio fingerprinting, so just built this system for kicks. I'm not sure if there's any real positive use for it - maybe identifying mislabeled tracks, etc... first time I'm trying out a newly released mystery jam.