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It's a fantastical tale about a Union soldier in the Civil War who reads Ada Lovelace's notes on the difference engine and dreams of a 'steam brain' that will be sufficiently smart that it will end war. Correspondence between the two, all manner of singing singing, duets, speechifying, comparisons of the limits each works under, and lots of weird percussion instruments ensue.
I liked it. Some good performances, some really good moments, and some good music - both new stuff and old folky stuff.