Five choirs, from Norway, Finland, Swiss and Iceland, will perform together with Fóstbræður in this concert. Special guests are Egill Ólafsson and Stórsveit Reykjavíkur (Reykjavík Big Band). The five choirs relate to Fóstbræður in various ways. Muntra Musikanter have been good friends with Fóstbræður for 80 years and these two choirs have performed together in Iceland, Finland and Russia. The members of Muntra originate from Akademiska Sangforeningen so these two choirs are closely connected. Den Norske Studentesangforening is the oldest and one of the most prominent male choir in Norway.
Mannerstimmen Basel is renowned and decorated male choir from Swiss. There always has been healthy rivalry between Karlakór Reykjavíkur and Fóstbræður, like any other Icelandic male choirs.