The closest thing we have to this in Brazil is the biggest Oktoberfest of Brazil that happens every year in Blumenau (city of the state Santa Catarina). I've been there once, my grandfather and my father went too (we have chopp mugs from this event). I think that the most classical song that they play there is : "Zigge Zagge, Hoi, Hoi, Hoi" by Kristall Quintett. Here's a video from this oktoberfest of Brazil, featuring this song:
https://youtu.be/C6LNgrvEdew?si=niREZzPaVXzDPmxPEdit: I found my mug. I've been there in 2013. Here's a foto of my mug:

PS: the first event happened in 1984. So it's been 40 years.