I had this music box part for a while, but no box, and I just recently got the perfect little box to keep it in :)
I drilled a hole in the bottom for the wind-up part, and glued a wood piece into the lid to push the stopper down when it closes (so the music stops when the lid is closed, and starts when it opens).
The song it plays is part of “Eine Kleine Nachtmusik” by Mozart.