Oh, I posted that Erzya song once on the "what song are you listening to right now?" thread.
Chuj is a Mayan language spoken mainly in Guatemala and to a lesser extent in Chiapas, Mexico, where its closest relative, Tojolabal, is also spoken. There are two main varieties, one spoken in the municipality of San Mateo Ixtatán and the other, in San Sebastián Coatán. This song, "Chonhab' Wajxaklajunh," is from (and dedicated to) Ixtatán:
https://www.youtube.com/watch?v=bqWT1oKVEmI