Two of Iceland’s hippest bands unite to put on a concert by themselves, without any label or bookers, just for the chance to mess with each other’s sounds. One of the most original young trios around, Samaris blend Icelandic folk sensibilities with thumping beats and synths. Mammút, on the other hand, are true wizards of post-punk and art-rock. Set in the old theatre of Gamla Bíó, the gig promises to be unique in more ways than one.