When the songs celebrating the alcoholic beverages are generally made with 3 chords and the same melody repeated dozen of times, Argentine people like to compose this kind of score which gives you an headache at first sight but becomes very fun to play on a duet as you go along drinking and playing it. For those who are interested I began to write the sheet musics of the different tunes that I'm playing and I'll send it here in another thread when it will be completed:
https://youtu.be/CrD9q5qg-t4