Question: Sanrabb is one of the founding members of which extreme subgenre of heavy metal music?

Context paragraphs:
Black metal: Black metal is an extreme subgenre 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.

List of American death metal bands: This is a list of death metal bands that were originally formed in the United States of America.  Death metal is an extreme subgenre of heavy metal music.  It typically employs heavily distorted guitars, tremolo picking, deep growling vocals, blast beat drumming, minor keys or atonality, and complex song structures with multiple tempo changes.

List of gothic metal bands: This is a list of gothic metal bands.  Gothic metal is a genre of heavy metal music.  It is characterized as a combination of the dark atmosphere of gothic rock with the aggression of heavy metal music.  The genre originated during the early 1990s in Europe as an outgrowth of death/doom, a fusion of death metal, doom metal, and gothic rock.  The music of gothic metal is diverse with bands known to adopt the gothic approach to different styles of heavy metal music.  Lyrics are generally melodramatic and dark with inspiration from gothic fiction as well as personal experiences.

Thrash metal: Thrash metal is an extreme subgenre of heavy metal music characterized by its fast tempo and overall aggression.  The songs usually use fast percussive beats and low-register guitar riffs, overlaid with shredding-style lead work.  The lyrics often deal with social issues and reproach for The Establishment, using direct and denunciatory language, an approach borrowed from hardcore punk.

Death-doom: Death-doom is an extreme subgenre of heavy metal.  It combines the slow tempos and pessimistic or depressive mood of doom metal with the deep growling vocals and double kick drumming of death metal.  The genre emerged in the late-1980s and gained a certain amount of popularity during the 1990s, but had become less common by the turn of the 21st century.  In turn, death/doom gave rise to the closely related genre of funeral doom as well as to the more melodic and romantic gothic metal.

Extreme metal: 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".  The term usually refers to a more abrasive, harsher, underground, non-commercialized style or sound associated with the speed metal, thrash metal, death metal, black metal and doom metal genres.  With the exception of doom metal, all of these genres are characterized by fast tempos, attesting to their roots in hardcore punk, which has also fused with extreme metal in the forms of crossover thrash, crust punk, grindcore, sludge metal and metalcore.  Though many extreme sub-styles are not very well known to mainstream music fans, extreme metal has influenced an array of musical performers inside and outside heavy metal.

List of avant-garde metal artists: This is a list of avant-garde metal artists, regional scenes, and record labels.  Avant-garde metal or avant-metal, also known as experimental metal, is a subgenre of heavy metal music loosely defined by use of experimentation and characterized by the use of innovative, avant-garde elements, large-scale experimentation, and the use of non-standard and unconventional sounds, instruments, song structures, playing styles, and vocal techniques.  It evolved out of progressive rock and various forms of metal, including extreme metal, particularly the extreme subgenre death metal.  Some early examples are the King Crimson releases "Larks' Tongues in Aspic" and "Red" in 1973 and 1974 respectively, and the 1976 Led Zeppelin album "Presence".  The genre emerged in the early 1980s through the efforts of bands such as Celtic Frost and Voivod, who pioneered the genre.  Other pioneers of avant-garde metal include Boris, Earth, Helmet, maudlin of the Well, Neurosis, Sunn O))), and Mr. Bungle.  In the late 1990s, Misanthropy Records emerged as a promoter of Norwegian avant-garde metal until it folded in 2000, and, according to Jeff Wagner, in the late 1990s and early 2000s, a so-called "new wave of avant-garde metal" was spearheaded by The End Records.  Some other record labels which promote avant-garde metal are Aurora Borealis, The Flenser, Holy Records, Hydra Head Records, Ipecac Recordings, Napalm Records, the Relapse Entertainment imprint of Relapse Records, Seventh Rule Recordings, and Southern Lord Records.  In the United States, local avant-garde metal scenes have emerged in the San Francisco Bay Area, with bands such as Giant Squid, Grayceon, and Ludicra, Boston, with bands such as Isis, Kayo Dot, and maudlin of the Well and Seattle.  According to the "New York Times", some regional scenes that developed in the mid-1990s included the cities of Tokyo, Los Angeles, and Oslo.

Sanrabb: Sanrabb is a Norwegian black metal musician and one of the founding members of black/death metal band Gehenna.

Chinese heavy metal: Chinese heavy metal (中国重金属, pinyin: "Zhōngguó Zhòngjīnshǔ"; also 中国重金属音乐, "Zhōngguó zhòngjīnshǔ yīnyuè", literally "Chinese heavy metal music") is commonly used to describe a wide variety of forms of heavy metal music, in connection with the rock bands and solo artists from native Chinese-speaking regions (including Mainland China, Taiwan, Hong Kong, Macau, etc.).  Typically, Chinese heavy metal bands adhere to one subgenres of heavy metal such as death metal, thrash metal, and power metal, but commonly using Chinese-based lyrical content rather than English.

Death metal: Death metal is an extreme subgenre of heavy metal music.  It typically employs heavily distorted and low-tuned guitars, played with techniques such as palm muting and tremolo picking, deep growling vocals, aggressive, powerful drumming featuring double kick or blast beat techniques, minor keys or atonality, abrupt tempo, key, and time signature changes and chromatic chord progressions.  The lyrical themes of death metal may invoke slasher film-stylized violence, religion (sometimes Satanism), occultism, Lovecraftian horror, nature, mysticism, mythology, philosophy, science fiction, and politics, and they may describe extreme acts, including mutilation, dissection, torture, rape, cannibalism, and necrophilia.

Supporting paragraphs: Sanrabb Black metal
Answer: Black metal