When my kids were little, a Mister Softee driver gave away matchbox-sized Mister Softee trucks. They had a button on top that would play the song.

I got one. From time to time, I'd pull it out of it's hiding place and press the button. My kids would lose their minds and run outside looking for the truck.

I still have it, but the battery inside is dead, and it wasn't designed to be replaceable.