A few weeks ago, we interviewed Filips Lindfors, who composed two Dziesma 2013 entries: “Upside Down” by Sabine Berezina and “Phoenix Fly” by Kristine Somase. Today, we interview his co-composers of “Upside Down,” Kristoffer Eriksson and Bertel Osterberg. ESC UNITED: Hi Kristoffer and Bertel. Congratulations on making it to the next stage of Dziesma 2013. Tell us a bit about yourselves and …