Ethereal! My late mother was a great lover of music and of this piece of Bach, which she played in Advent. She'd have loved this! (Wish I had one! Have only ever seen one once in a museum...unplayed). Thank you for sharing it!

_Very_ interesting! Somewhat wild guess, but, it seems like the roughly 4 divisions on the "tonearm" (or whatever term is used here) might correspond roughly to the classic "SATB" (soprano, alto, tenor, bass). And, my mind immediately suggests that the bass is likely to be closest to the spindle - that a lot of music (esp. music that might have been manufactured onto a disc for this machine) doesn't have as much movement lower down anyway, but you would want to be able to have more notes (e.g., like 16th notes etc.) in the soprano voice, especially, for example. Watching the video a bit more, I think I can roughly pick that out ... definitely some interesting mathematics to render music in this form, I'd think. The "linear speed" varies continuously across the radius of the disc. Not that tricky, I suppose - now that it's been on my mind for a minute or two - but, definitely an interesting "map" (function) there, in some sense (from my perspective as being so disconnected from this kind of tech at this point ... so used to basically "digital logic" ... it's refreshing to see and think about something like this)... Very pleasant music, as well. Always loved this tune and harmonization. Very pleasant rendered on a music box this way. Thanks for sharing!