Here’s a switch hit;
I’ve always been mildly interested in player pianos, and Merry-Go-Round organs that play by player rolls. By extension, then, I’ve also been interested in MIDI files… since the days of the C=64 and SID files.
Here’s a link [1] you’ll wnat to see. Apparently this guy takes old palyer Piano rolls, and translates them to Midi files. Free downloads, too.