What Is It Like To Be A Musician at the Mexico Pavilion

This link has a video interview of a couple of brothers who are musicians at the Mexico pavilion at Epcot's World Showcase. The blub says:

What's it like to work at Walt Disney World? We spent the day with two brothers, Randy and Esteban Carrillo, who have worked at Epcot's Mexico pavilion in World Showcase for as long as the Orlando theme park has been open.

I had a wrong impression that the musicians are also part of the international cast members that Disney brought in, i.e. they're temporary cast members from Mexico. Obviously, from the video, these are "permanent" cast members. It also makes sense since they are considered as performers and part of the performers union.

Zz.