-Tetsijtsilin- is a nahua word which means "stones who sing" and It´s also the name of a school created to be a counterweight of resistance from the community of San Miguel Tzinacapan, Cuetzalan, in Mexico's North Sierra.
It's ideology looks to preserve their ancient traditions including the language. In the community of Cuetzalan the Nahua language was disappearing and the school created a special Nahua subject so the students could learn it and practice there.
The traditional dances are taught by former students who comeback to the school very often to teach their knowledge.
The school was created in 1979 and the way of teaching and the respect to their traditions make it unique in all the country.