Question: Both Dødheimsgard and Avant-garde metal are both examples of what?

Context articles: La Masquerade Infernale
Peculate (band)
Cleric (band)
Avant-garde metal
Dødheimsgard
Satanic Art
Carl-Michael Eide
Monumental Possession
What's He Building in There?
List of avant-garde metal artists

La Masquerade Infernale (the title meaning "the infernal masquerade" in French) is the second studio album by Arcturus.
 Released by Misanthropy Records in 1997, the album is a huge step away from the slow, doom-influenced melodic black metal of "Aspera Hiems Symfonia".
 The album has a dark sound to it, featuring heavy use of synthesizers and samples, often making those elements more prominent than the guitar.
 Most of the songs revolve around the themes of theater, literature, and Satan.
 The characteristic screams of black metal are replaced by a gruff, low-toned clean vocal style, occasionally alternated with operatic singing or the bizarre high-pitched singing of guest singer Simen Hestnæs, who nine years later would replace Garm as the band's frontman.
 "La Masquerade Infernale" is regarded by many as Arcturus' masterpiece and one of the greatest examples of avant-garde metal.
 It was reissued in 2003 by Candlelight Records, given a somewhat louder remastering and without the hidden track before track 1.
Peculate is an American avant-garde metal and progressive metal band, formed in 2012.
 Peculate "combines metal, djent, jazz, contemporary classical, avant-garde, electronic, and experimental music together to create progressive music with punk sensibilities."
 Much of Peculate's music is composed using the 12-tone technique.
 Metal blog Invisible Oranges describes the hallmarks of the band's sound as the "utilization of twelve-tone technique, the Zappa jazz fusion tangents, and the Devin Townsend-esque attention to production details."
Cleric is an American avant-garde metal band based out of Philadelphia, Pennsylvania, United States.
 Formed in 2003, their initial lineup consisted of guitarist Matt Hollenberg, drummer Larry Kwartowitz, vocalist Nick Shellenberger and bassist Chris Weindel.
 After their first EP Chris Weindel was replaced by James Lynch, who was succeeded by bassist Daniel Ephraim Kennedy in 2012.
 Informed by metal pioneers such as Meshuggah, Converge, Fantômas, and Neurosis, the band is known for their experimental approach to grindcore, doom and avant-garde metal.
Avant-garde metal, also known as avant-metal or experimental metal, is a subgenre of heavy metal music loosely defined by use of experimentation and innovative, avant-garde elements, including non-standard and unconventional sounds, instruments, song structures, playing styles, and vocal techniques.
 Avant-garde metal is influenced by progressive rock and extreme metal, particularly death metal, and is closely related to progressive metal.
 Some local scenes include Los Angeles, the San Francisco Bay Area, Boston, and Seattle in the United States, Oslo in Norway, and Tokyo in Japan.
Dødheimsgard (also known as DHG) is a Norwegian extreme metal band formed in 1994.
 Dødheimsgard was originally a black metal band, but 1999's "666 International" saw them change into an experimental and avant-garde / industrial metal band.
 In 2000, they shortened their name to DHG.
Satanic Art is an EP by Norwegian black metal band Dødheimsgard.
 It was released in May 1998, by Moonfog Productions.
 "Satanic Art" marks the beginning of Dødheimsgard's transition from black metal to a more industrial/avant-garde sound, which was not fully realized until their next album, "666 International" (1999).
Carl-Michael Eide (born 24 July 1974) is a Norwegian black metal musician, multi-instrumentalist (mainly known as a drummer), and vocalist.
 He is also known under stage names Aggressor, Czral and Exhurtum.
 He has played in various black metal and avant-garde metal bands.
 These include Ved Buens Ende, Aura Noir, Cadaver, Dødheimsgard, Satyricon, Ulver, Infernö and recently the jazz/rock band Virus.
 His drumming is unusual in style, with very little repetition and a tendency to shy away from traditional drumming.
Monumental Possession is the second studio album by Norwegian black metal band Dødheimsgard.
 It was released in 1996, through the record label Malicious.
 It is their second and final completely black metal album, before the band incorporated industrial and avant-garde elements into their sound on future releases.
 "Monumental Possession" was re-released in 1999 by Century Media Records.
What's He Building in There?
 was a Canadian avant-garde metal band, formed in 2006 in Waterloo.
 The band's music combined elements of funk, avant-garde metal and progressive rock.
 The band, named after a Tom Waits song from "Mule Variations", were known for their live show in which they usually wear outrageous costumes.
 They have been said to "create a sort of audio psychosis that totally envelopes and surrounds the listener like a straight jacket," and their debut album has been described as "an unlikable masterpiece."
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.