Given the question: Information: - Folk metal is a fusion genre of heavy metal music and traditional folk music that developed in Europe during the 1990s. It is characterised by the widespread use of folk instruments and, to a lesser extent, traditional singing styles (for example, Dutch Heidevolk, Danish Sylvatica and Spanish Stone of Erech). It also sometimes features soft instrumentation influenced by folk rock. - Heidevolk is a pagan folk metal band from the Netherlands. The lyrical themes of their music are inspired by nature, the history of Gelderland, and the history of Germanic mythology. Most of their lyrics are in Dutch; however, since their album Velua they also have one original English song, Vinland, and several English covers. - Midnattens Widunder ( English : Beasts / Behemoths / Monsters of Midnight ) is the debut studio album by Finnish folk metal band Finntroll . It was released in Finland in 1999 by Spinefarm . - Finland , officially the Republic of Finland, is a sovereign state in Northern Europe. A peninsula with the Gulf of Finland to the south and the Gulf of Bothnia to the west, the country has land borders with Sweden to the northwest, Norway to the north, and Russia to the east. Estonia is south of the country across the Gulf of Finland. Finland is a Nordic country situated in the geographical region of Fennoscandia, which also includes Scandinavia. Finland's population is 5.5 million (2014), staying roughly on the same level over the past two decades. The majority of the population is concentrated in the southern region. In terms of area, it is the eighth largest country in Europe and the most sparsely populated country in the European Union. - Folk music includes both traditional music and the genre that evolved from it during the 20th century folk revival. The term originated in the 19th century but is often applied to music that is older than that. Some types of folk music are also called world music. "Traditional folk music" has been defined in several ways: as music transmitted orally, music with unknown composers, or music performed by custom over a long period of time. It has been contrasted with commercial and classical styles. - Finntroll is a folk metal band from Helsinki, Finland. They combine elements of black metal and folk metal. Finntroll's lyrics are mostly in Swedish, the only exception being the song "Madon Laulu" on "Visor Om Slutet". Finntroll's original singer, Katla, decided to use Swedish over Finnish since he was part of a Swedish-speaking minority in Finland and the sound of the language seemed to better suit the band's "trollish" outfit. Despite several vocalist changes, this tradition has continued. - Heavy metal (or simply metal) is a genre of rock music that developed in the late 1960s and early 1970s, largely in the United Kingdom and the United States. With roots in blues rock and psychedelic/acid rock, the bands that created heavy metal developed a thick, massive sound, characterized by highly amplified distortion, extended guitar solos, emphatic beats, and overall loudness. Heavy metal lyrics and performance styles are sometimes associated with aggression and machismo. - Folk rock is a musical genre combining elements of folk music and rock music. In its earliest and narrowest sense, the term referred to a genre that arose in the United States and the United Kingdom around the mid-1960s. The genre was pioneered by the Los Angeles band the Byrds, who began playing traditional folk music and songs by Bob Dylan with rock instrumentation. The term "folk rock" was coined by the U.S. music press to describe the Byrds' music in June 1965, the month in which the band's debut album was issued. - Visor om slutet is an all-acoustic folk metal EP by the Finnish band Finntroll. It was released in 2003 by Spinefarm. It was the first album to feature Tapio Wilska on vocals, and the last to feature Jan "Katla" Jamsen, who was forced into retirement in 2003 due to a tumour developing on his vocal cords. - Black metal is an extreme subgenre and subculture of heavy metal music. Common traits include fast tempos, a shrieking vocal style, heavily distorted guitars played with tremolo picking, raw (lo-fi) recording, unconventional song structures, and an emphasis on atmosphere. Artists often appear in corpse paint and adopt pseudonyms. - A folk instrument is a musical instrument that developed among common people and usually does not have a known inventor. It can be made from wood, metal or other material. Such an instrument is played in performances of folk music. - A troll is a class of being in Norse mythology and Scandinavian folklore. In Old Norse sources, beings described as trolls dwell in isolated rocks, mountains, or caves, live together in small family units, and are rarely helpful to human beings. - Helsinki is the capital and largest city of Finland. It is in the region of Uusimaa, in southern Finland, on the shore of the Gulf of Finland. Helsinki has a population of , an urban population of 1,214,210, and a metropolitan population of over 1.4 million, making it the most populous municipality and urban area in Finland. Helsinki is located some north of Tallinn, Estonia, east of Stockholm, Sweden, and west of Saint Petersburg, Russia. Helsinki has close historical connections with these three cities. After reading the paragraphs above, we are interested in knowing the entity with which 'midnattens widunder' exhibits the relationship of 'genre'. Find the answer from the choices below. Choices: - acid rock - album - black metal - blues rock - country - folk metal - folk music - folklore - fusion - genre - heavy metal - heavy metal music - history - music - musical - mythology - norse mythology - rock - rock music - urban - world music
The answer is:
black metal