Extreme metal is a number of related heavy metal music subgenres that have developed since the early 1980s, usually characterized by a more abrasive, harsher, underground, non-commercialized style or sound nearly always associated with genres like black metal, death metal, doom metal, thrash metal, and sometimes speed metal.
Though many extreme sub-styles are not very well known to mainstream music fans, as extreme metal is by definition a counterculture, extreme metal has influenced an array of musical performers inside and outside of heavy metal.
Read more about this topic: Heavy Metal Subgenres
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