Did you know: if you have a trophy for collecting all five musicboxes in a set (like the DG, BB or DB trophy) you can play their melodies directly from it, like this?
It's true. The trophy has to be on display (ie on the shelf, not inside the cabinet) and you don't get any of the XP rewards (or energy penalties), but if you want to hear that rousing spaghetti western tune from DG-5, you can now do it without rummaging in your inventory (or on your floor) for the actual box.
I haven't tried this myself, but I'm told you can even do this if you no longer own the boxes.
(This might not be news to everyone, but it surprised me.)