doom/death metal. The band formed in 1991, also combining Jewish, Arabic, and other West Asian influences while Ensiferum mix folk music on top of a power and death metal hybrid. A few groups are also known to incorporate the styles of other music genres outside of heavy metal. Examples include the punk rock in the music of Glittertind and the neofolk and post-rock tendencies of Agalloch. The folk elements in the genre often reflect the ethnic background of the musicians as is the case for the Finnic folk music in Finntroll, Korpiklaani, and Metsatöll, the Baltic folk music in Skyforger, East Asian influences such as Chthonic's use of Taiwanese folk music or Tengger Cavalry's incorporation of Mongolian throat singing, or the Middle Eastern background of Orphaned Land. However, some bands defy the geographical and ethnical background, like Ymyrgar, who hail from Tunisia but chose to focus on Norse mythology. Celtic music can be found among such Irish groups as Cruachan and Waylander as well as bands outside Ireland like Ithilien from Belgium, Eluveitie (although Switzerland can be considered a country with a Celtic history), and Tuatha de Danann (from Brazil, a country that has no cultural ties with the Celts whatsoever, despite the similarity of the country's name to an island in Irish myth). Folk music from multiple regions are employed by some groups like Elvenking, Ithilien and Ensiferum. The genre also offers a variety of atmosphere and moods. A fun and cheerful nature is characteristic of groups like Finntroll and Korpiklaani. Both bands are also noted for playing music that one can dance to. In contrast, other acts such as Thyrfing and Primordial are known for their contemplative atmosphere. Lumsk offers a more mellow style while Agalloch are known for their "depressive ambient" sound. An epic atmosphere is characteristic of some folk metal bands like Primordial, Moonsorrow, Turisas and the music project Folkearth. Groups like Ensiferum and Wintersun are known to have a melodious side while bands that favor a more blistering or brutal approach can be found in groups like Finntroll and Månegarm. Instruments Folk metal feature the same typical instruments found in heavy metal music: guitars, bass, drums and vocalist. While a few folk metal groups like Tharaphita discard "any notion of utilising folk instrumentation" and "rely solely on traditional metal instruments," bands in the genre generally rely on folk instruments that range from the common to