These guys and the like are out in force because of the arrival of the Cervantino Festival crowd.
I’m sitting on a park bench trying to eat my entire bag of pastries (pastries are a specialty with shops everywhere) and it seems they are going to stand there singing until I come up with some money. They sang a few verses of Blue Moon until I asked them por favor, en español, and was treated to Besame Mucho, which was at least more entertaining than Blue Moon!