Paraguayan thrash metal band keeps it real with native tongue
9 August 2012 Last updated at 11:10 BST
Kuazar were the first thrash metal band in Paraguay to sing in Guarani, which, along with Spanish, is their country's official language.
According to band members, the strength of their native tongue matches perfectly the content of their lyrics and their hard rock ethos.
This is the second video in a series by BBC Mundo's Vladimir Hernandez about new native melodies coming out of Latin America ahead of the International Day of Indigenous Peoples which is celebrated by the United Nations every August 9.