Nordic folk music includes a number of traditions of Nordic countries, especially Scandinavian. The Nordic countries are Iceland, Norway, Sweden, Denmark and Finland. The many regions of the Nordic countries share certain traditions, many of which have diverged significantly. It is possible to group together Finland, Estonia, Latvia and northwest Russia as sharing cultural similarities, contrasted with Norway, Sweden, Denmark and the Atlantic islands of Iceland and the Faroe Islands. Greenland's Inuit culture has its own musical traditions, influenced by Scandinavian culture. Finland shares many cultural similarities with both Baltics and the Scandinavian nations. The Saami of Sweden, Norway, Finland and Russia have their own unique culture, with ties to the neighboring cultures. Scandinavian music The dulcimer and fiddle are the two most characteristic instruments found throughout Scandinavia. In Norway, the eight- or nine-stringed hardanger fiddle is also found. Gammaldans are a kind of dance song played by harmonica and accordion, popular in both Sweden and Norway in the late 19th and early 20th century. Circle dancing while singing ballads is a historic part of the folk traditions of all of northern Europe. Only the Faroe Islands have maintained this tradition to the present day, though it has been revived in some other areas. Iceland is home to many ancient musical practices no longer found elsewhere in the Nordic area, such as the use of parallel fifths and organum. Greenland's Inuit population has their own musical traditions, which have been melded with elements of Nordic music, such as the kalattuut style of Greenlandic polka. Finland was long ruled by Sweden, so much of Finnish culture is influenced by Swedish. There are a number of Swedes living in Finland, and vice versa. These communities have produced traditional and neo-folk musicians like the Swedish-Finn Scea Jansson and Gjallarhorn, and the Finnish-Swedish Norrlåtar and JP Nyströms. Baltic psalteries are a family of related plucked box zithers played throughout Finland (kantele), the Baltic states (kannel in Estonia, kanklės in Lithuania and kokles in Latvia respectively) and northwest Russia (krylovidnye gusli). A bowed lyre (Swedish tagelharpa, Estonian talharpa or hiiurootsi kannel, Finnish jouhikko or jouhikantele) was formerly played among Swedes living in Estonia, but usage declined until a recent revival. In the 19th century, all the Baltic states saw an influx of foreign instruments and styles, resulting in fusions like the zither kokles and German-influenced ziņģe singing style of Latvia. Sami music The Sami are