I used to see lots of these when I was growing up in England. They played music, and when we heard them coming, we would rush in to our parents to get money to buy something.
I don’t recall seeing many of them nowadays, possibly because there are no children in the immediate vicinity, and there are no convenient places to stop.
I had the opportunity to speak to Mr. Angamarca. He was happy to chat for a while, and for me to take his picture. But he did insist that I show his telephone number. So there it is in the third picture: 929-306-9555
Taken with a Kodak Easyshare 880.