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On that main central plaza there were dozens of musicians. I speculate that Guanajuato has got to have one of the highest stringed instrument to inhabitant ratios of any city in the world. We took a tour with these guys one night that started on the plaza and wandered through the tiny alleyways as they sang and played their instruments. One of them carried a string bass (no kidding- a full sided string bass) and played and sang at the same time. Whenever we got to a place where there was enough room for it, we would stop and they played a few songs and told jokes. It was really amazing.