Extreme metal is a loosely defined umbrella term for a number of related heavy metal music subgenres that have developed since the early 1980s. The term usually refers to a more abrasive, harsher, underground, non-commercialized style or sound nearly always associated with genres like thrash metal, black metal, death metal, doom 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. Wikipedia [ - ]

Extreme metal is a loosely defined umbrella term for a number of related heavy metal music... [ + ]