Player piano roll scanners
I had a lot of fun imagining different solutions to the problem, and did a bit of research on the mechanics, timing, etc. I just never get around to building anything. And now that I’ve seen this amazing photo album, I’m okay with that. It’s already been done every possible way.
You can download MIDI versions of digitized rolls at the International Association of Mechanical Music Preservationists roll archive.
I leave you with “In the Good Old Summertime” circa 1902.