Capital Stockholm 59°21′N 18°4′E Official languages Swedish (de facto) Government Representative parliamentary democracy under a constitutional monarchy King Carl XVI Gustaf Prime Minister Fredrik Reinfeldt Accession to EU January 1, 1995 Total area 449,964 km² (173,732 sq mi) Water (%) 8.67 Population (2006) 9,103,551 Density 20/km² (52/sq mi) GDP total (2005) $270.516 billion GDP per capita $29,898 HDI (2006) 0.951 Currency Swedish krona (SEK) Time zone CET (UTC+1) Capital Stockholm Water (%) 8.67 9°21′N 18°4′E Population (2006) 9,103,551 Official languages Swedish (de facto) Density 20/km² (52/sq mi) Government Representative parliamentary GDP total (2005) $270.516 billion democracy under a constitutional monarchy GDP per capita $29,898 King Carl XVI Gustaf HDI (2006) 0.951 Prime Minister Fredrik Reinfeldt Currency Swedish krona (SEK) Accession to EU January 1, 1995 Time zone CET (UTC+1) Total area 449,964 km² (173,732 sq mi) Sweden has a rich musical tradition, ranging from medieval folk ballads to house music. The music of the Vikings has been lost to history, although there have been historical attempts to recreate how it could have sounded based on instruments found in Viking sites. Instruments used were the lur (a wooden trumpet), simple string instruments, wooden flutes and drums. It is possible that the Viking musical legacy lives on in some of the old Swedish folk music. Carl Michael Bellman, Wilhelm Stenhammar, Wilhelm Peterson-Berger, Hugo Alfvén, Franz Berwald, and Johan Helmich Roman are among Sweden's great classical composers. The best-known opera singers are the 19th century soprano Jenny Lind and the 20th century tenor Jussi Björling, who had great success abroad. Björling is considered by many to be the epitome of a great tenor. Also sopranos Christina Nilsson, Birgit Nilsson, and tenor Nicolai Gedda, baritone Håkan Hagegård and the contemporary mezzo-soprano Anne-Sofie von Otter have become known in the world of opera. Evert Taube, Povel Ramel, Cornelis Vreeswijk are all popular modern troubadours, considered to be classics in Swedish music. Swedish cinema is one of the most widely-known national film industries in the world. This is partly due to the innovation of its early days. The silent period saw the flourish of the gifted visionaries Mauritz Stiller and Victor Sjöström, who brought international attention to Swedish filmmaking and its particular vision of the world. Ingmar Bergman, regarded as one of the most influential filmmakers of the 20th Century, emerged as a prominent figure in world cinema during the 1950s with his existential epic The Seventh Seal, which he followed with a host of critically revered psychological dramas. Two of his films in particular, Persona and Cries and Whispers, received unparalelled critical adoration and put Sweden in the map as a one of the most progressive cinematic entities. The revered naturalist Jan Troell as well as the socially conscious Bo Widerberg would quickly follow Bergman as the country's foremost visual artists. Famous actresses and actors include Ingrid Bergman, Greta Garbo, Max von Sydow, Stellan Skarsgård, Ingrid Thulin, Lena Olin and Peter Stormare.