Inat 15:25 there is a very long pipe instrument with no holes. It is supposedly a folk instrument from Argentina since the piece is Misa Criolla by Ramirez, which relies on a lot on Argentinian folk music. What is it called?
That is known as an Erke.
The erke (alternatively erque, coroneta, or quepa) is a large labrophone (lip reed) instrument native to the Gran Chaco of Bolivia, northern Chile, and Argentine Northwest. (SOURCE: Wikipedia)
(PHOTO CREDIT: By N J.O. Zavalía - https://www.flickr.com/photos/122267223@N07/13614627804/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=31981921)