I am foreign and about 7 years ago, my wife and I were visiting Mexico City for the first time. Due to traffic, we decided to use the metro from the historic center to Chapultepec. It was our first time using it. After 2 or 3 stops on the train, this very thing happened to us. There was a boy accompanied by a girl who was singing during their act. At that moment, I couldn't understand or speak much Spanish, but my wife could