Tap Counter. Not a game. It's a screen full of buttons that you tap to increment the count. Something like a little clicker that you push to count, except you have a lot here.
Well done! Now make it have 2 modes - one to click up the numbers, and one that doesn't change the numbers, but plays the corresponding sound effect instead :)
If you want music box, I think it's better to set the values inside the code directly. But here's the improvement you're looking for. I added extra functionality just because it's so easy! :)