of related & similar interest:

"Mariachi music remains Mexico's national song.

Another important music style is the traditional norteño, or northern tunes, which has been the basis for such variations as banda music. These styles are popular in many regions of Mexico. Norteño, similar to Tejano music, arose in the 1830s and 40s in the Rio Grande region, south of Texas. Influenced by Bohemian immigrant miners, its rhythm was derived from the European polka dance popular during the 1800s. Banda, similar to norteño in musical form, originated from the Mexico state of Sinaloa during the 1960s."

http://en.wikipedia.org/wiki/Music_of_Mexico

I have fond but very vague memories of rural traditional Moravian Easter/Spring Folk Festivals back in the early 1990's..