Chamamé is THE music that's played and danced in any decent party in the north east of Argentina, Paraguay and south of Brazil. It's a result of the mixture of different cultures, there's a huge immigration in this area, from all over the world. It's said that it was imported from Germany and had the influence here of Guaranies and Spaniards, hence the relevance of the accordion over the guitars. For foreigners, their first impression is that it sounds a bit like a polka.
This is just a snapshot, the band was playing and I was leaving the backstage when I saw the little kid playing the acordeon, emulating the band's accordionist (the guy in the right). I used PS to overexpose these two musicians and underexpose all the rest. As I said, not a great photo, just a nice moment. Love his look, he was very focus on emulating his idol.