That Marble Machine is the inspiration from the automated piano gadgets. The guy even wanted to inspire from the self-playing violin to make an upgrade of the marble machine.
I agree with the thought that it would give us something to do between updates, as well as being a VAST improvement over noteblocks & jukeboxes from Minecraft. Rising World has this potential, thus I'm suggesting it so we can make use of it for when the time comes. I'd love to see what people would do with the sheet music, as well as import music into my world from other worlds that I'd even hope for Workshop support. Imagine also having a storage case for the sheet music, similar to how Mystcraft mod for Minecraft handles 'pages' to craft teleporting worlds and such using books, after having used those pages to write up a world.
Shall be fun.