Finland's First Lady Jenni Haukio, Queen Margrethe of Denmark, King Carl Gustaf of Sweden, &lt;a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Queen+Silvia+of+Sweden&amp;family=editorial&amp;specificpeople=160332 ng-click='$event.stopPropagation()'&gt;Queen Silvia of Sweden&lt;/a&gt; and President Sauli Niinisto of Finland are pictured at Stockholm Concert Hall, April 21, 2015. 2015 marks the 150th anniversary of Nordic composers &lt;a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Jean+Sibelius&amp;family=editorial&amp;specificpeople=905695 ng-click='$event.stopPropagation()'&gt;Jean Sibelius&lt;/a&gt; of Finland and Carl Nielsen of Denmark, celebrated at the Stockholm Concert Hall with a two-week Sibelius-Nielsen festival. AFP PHOTO / TT NEWS AGENCY / CLAUDIO BRESCIANI +++ SWEDEN OUT