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The Book of Knots is a Brooklyn experimental art rock studio collective formed in the spring of 2003 at Joel Hamilton and Tony Maimone's Studio G, with Matthias Bossi and Carla Kihlstedt completing the core quartet. The group built a trilogy of themed concept albums: the self-titled debut (Arclight, 2004) about failed sea voyages, Traineater (Anti-, 2007) about crumbling Midwestern rust belt towns, and Garden of Fainting Stars (Ipecac Recordings, 2011) about flight and space travel. Their records feature a rotating cast of guest vocalists and musicians including Tom Waits, Mike Watt, Mike Patton, David Thomas, Blixa Bargeld, and Jon Langford.

This node covers the bombastic pole of Devin Townsend's sprawling solo catalog: the Devin Townsend Project's louder releases (Addicted, Deconstruction, Epicloud, Transcendence), the Ziltoid the Omniscient rock opera and its sequel Z², and later records like Empath and PowerNerd. Deconstruction is critic-described as "progressive metal, avant-garde metal, industrial metal, and symphonic metal" — "the most deranged, complex and sonically overwhelming" work in his catalog — while Ziltoid is a self-voiced sci-fi rock-opera parody delivered with "Python-esque absurdity." Empath was built explicitly to cram every style in his catalog into one record.

Buckethead (Brian Patrick Carroll) is an American guitarist from the San Francisco Bay Area, famous for performing in a white mask and a KFC bucket and for one of the most prolific solo discographies in music, numbering hundreds of albums. His playing spans thrash, fingerpicking, slap and avant-improv, and he conceives much of his output as soundtracks for rides at his imaginary amusement park, Bucketheadland. He released his 1992 debut on John Zorn's Avant label and that same year became the guitarist of Bill Laswell's supergroup Praxis.

The Ocean (also known as The Ocean Collective) is a German post-metal band formed in 2000 in Berlin by guitarist and principal composer Robin Staps, built around a fluid, revolving cast of musicians. Their sound blends post-metal, progressive metal, sludge and avant-garde elements across ambitious concept albums exploring geology, evolution and oceanic depths, including Precambrian (2007), the paired Heliocentric and Anthropocentric (2010), Pelagial (2013), and the Phanerozoic double-album series (2018-2020). The band released early records via Make My Day Records before signing to Metal Blade Records, and Staps also runs the post-metal imprint Pelagic Records.

Helium Horse Fly are a Liège, Belgium avant-garde/experimental-rock act formed in 2009, fronted by vocalist/keyboardist Marie Billy alongside guitarist Stéphane Dupont, bassist Dimitri Iannello and drummer Gil Chevigné (who replaced founding drummer Bastien Dupont in 2014). Critics have described their sound as 'progressive baroque hardcore' and compared its dark, brooding intensity to Kayo Dot, spanning EPs A Dispute to Redefine Clearly Frontiers Between Devils and Angels (2010) and Fishing for Ghosts (2011) through the albums Helium Horse Fly (2013) and Hollowed (2019). Reviewers place them across post-metal, art rock and experimental-rock tags.

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Free Salamander Exhibit is an avant-rock band from Oakland, California, formed by former members of Sleepytime Gorilla Museum. Comprising roughly four-fifths of that group's lineup plus additional players, the band pursues an art-prog / rock-in-opposition sound built around an arsenal of homemade instruments alongside guitars, bass, and drums. Their debut album, Undestroyed, was released December 13, 2016 on the Web of Mimicry label.

Danish industrial/progressive thrash outfit active in the early 1990s, known for bizarre stage costuming, thick facial makeup, and outrageous live shows that made them an unlikely precursor to Marilyn Manson and Slipknot. Their sole full-length, Just Human (1993, TBA Records), fused Godflesh-style industrial mechanization with dense polyrhythmic 'chugga-chugga' riffing that a Metal Archives review describes as predating Meshuggah's Destroy, Erase, Improve by two years. The band split up shortly after release, leaving only a 1992 demo and the one album behind.

Tomahawk is the Nashville-formed supergroup that pairs Mike Patton's shape-shifting vocals with Duane Denison's razor-wire guitar, born in 1999 when the two started swapping tapes after a Mr. Bungle tour stop. With John Stanier's piston-precise drumming and bass from Kevin Rutmanis (later Trevor Dunn), the band deals in taut, noirish alternative/avant-garde metal that splits the difference between The Jesus Lizard's angular menace and Patton's cinematic weirdness. Five albums on Patton's Ipecac Recordings — from the 2001 debut through 2021's Tonic Immobility — make it one of the label's flagship acts.

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Sleepytime Gorilla Museum is an Oakland avant-garde metal and experimental rock collective formed in 1999 from the ashes of Idiot Flesh, known for theatrical live rituals, dark literary lyrics, and an arsenal of self-built instruments. The band fuses avant-metal, progressive rock, industrial, and chamber influences into a deliberately uncategorizable sound. Active through 2011, the group reunited in 2023 and released the album "of the Last Human Being" in February 2024.

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San Francisco shape-shifters who smuggled funk, hip-hop, synth-pop, thrash, lounge and film-score bombast into stadium-sized alternative metal, peaking commercially with The Real Thing (1989) and creatively with the gloriously perverse Angel Dust (1992). When Mike Patton was poached from Mr. Bungle in 1988, the band became the primary launchpad for his sprawling avant-garde universe — making Faith No More the closest thing this atlas has to a mainstream gateway drug. Few bands did more to convince metal that genre borders were optional.

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