It's a music box, a very impressive one. But you don't need the Roland kit Lego even has sound modules for it: https://www.youtube.com/watch?v=mspB1BmO-F0 ht

It's a music box, a very impressive one. But you don't need the Roland kit Lego even has sound modules for it: https://www.youtube.com/watch?v=mspB1BmO-F0 https://www.youtube.com/watch?v=mspB1BmO-F0