Extreme metal is a loosely defined umbrella term for a number of related heavy metal music subgenres that have developed since the early 1980s. It has been defined as a "cluster of metal subgenres characterized by sonic, verbal, and visual transgression".[1]
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^Julian Schaap and Pauwke Berkers. "Grunting Alone? Online Gender Inequality in Extreme Metal Music" in IASPM Journal. Vol.4, no.1 (2014) p. 101
^K. Kahn-Harris, Extreme Metal: Music and Culture on the Edge (Berg Publishers, 2007), ISBN1-84520-399-2, p. 31.