This group investigates, spreads, teaches and interprets traditional Mexican music of different regions of the country. Respecting the instruments, the character and style of every place, their research, interpretation and ethnomusicológical investigations has derived in diverse publications: books, thesis, articles and discs, as well as academic placements in institutions specialized as the National Center of Investigation, Documentation and Musical Information of the INBA, the UNAM and the INAH, among others. The members of this set began more than twenty years ago. Since then, Ollín Yoliztli has appeared in the Nezahualcoyotl Room in the Palace of Fine Arts, as well as in other forums in the Mexico City and in the interior of the country. They also took part in international events such as the First Festival of Traditional Latin American Music, and the Symposium of Mexican Art, both were celebrated in California, USA.