Dr. Sándor Balatoni was invited to be a member of the jury of the 2nd Polifonia Mundi International Choir Competition in Osijek on April 25, 2026. The choir competition took place in the impressive Franjo Krežma concert hall with the participation of 12 choirs, who could compete in five different categories. The choirs came from Croatia, Bosnia and Herzegovina and Serbia. The other two members of the jury were Dr. Antoaneta Radočaj-Jerković. and Dr. Biljana Jeremić.