The Mars Volta

Cosa Brava is an experimental rock and free improvisation group formed in March 2008 in Oakland, California, by guitarist and composer Fred Frith (Henry Cow, Skeleton Crew, Naked City). All About Jazz described their sound as existing somewhere between folk, Celtic, modern chamber, Latin, funk, Eastern, and prog-rock. The quintet released Ragged Atlas (2010) and The Letter (2012) on Switzerland's Intakt Records, followed by Z Sides (2024). Its lineup draws together members of Sleepytime Gorilla Museum with longtime Frith collaborator Zeena Parkins.

Ground Zero was a Japanese improvising ensemble led by guitarist/turntablist Otomo Yoshihide, formed in 1990 to perform John Zorn's game piece Cobra and active until 1998. Its cut-and-splice orchestra collided free jazz, rock, noise and plunderphonics, pioneering turntables as a free-improv instrument on works like Revolutionary Pekinese Opera (1995), which resampled Chinese revolutionary opera. The band's Null & Void (1995) appeared on Zorn's Tzadik label, cementing its place in the Zorn/Downtown orbit.

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Praxis is producer/bassist Bill Laswell's shape-shifting experimental project, built around a core trio of Laswell, guitarist Buckethead and drummer Brain (Bryan Mantia) that fuses funk, jazz, hip-hop, dub and heavy metal into highly improvised music. The 1992 debut Transmutation (Mutatis Mutandis) drew in P-Funk's Bernie Worrell and Bootsy Collins, while the harsher 1993/94 album Sacrifist added John Zorn on saxophone and ex-Napalm Death drummer Mick Harris of Painkiller, plus vocalist Yamatsuka Eye. The result swings between noisy speed metal, dub and turntablist collage.

Mats/Morgan is a Swedish avant-fusion duo of keyboardist Mats Öberg (blind since birth) and drummer Morgan Ågren, playing together since the early 1980s. Their music is a hyper-virtuosic, genre-splicing brew of jazz fusion, avant-prog, free improvisation, electronica and modern classical, delivered with a mischievous sense of humor. Discovered as teenagers by Frank Zappa after he heard them perform in Stockholm in 1988, the pair went on to appear in his Zappa's Universe projects and have recorded prolifically for Cuneiform Records.

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Tantric Bile is the solo avant-death/free-jazz project of North American multi-instrumentalist Matt Stephens, who also leads Effluence and Neural Indent; the name is a nod to a Painkiller track. Since 2021 it has released a steady stream of albums on Stephens' own Putrefactive Recordings, blending guttural goregrind vocals with squealing saxophone-adjacent woodwinds, film samples and John Zorn/Naked City-style jump-cut composition, often joined by regular Effluence collaborators Paul Acuña and Ollie Burgess.

Trevor Dunn's Trio-Convulsant is the avant-garde jazz vehicle of Mr. Bungle bassist Trevor Dunn, active since 1997 and built on the idea of a compositional jazz trio that also wields rock's power chords — AllMusic called the result "moody jazz with convulsive rock." The group debuted with Debutantes & Centipedes (1998, Buzz Records) featuring guitarist Adam Levy and drummer Kenny Wollesen, then re-emerged on Ipecac with Sister Phantom Owl Fish (2004) in a new lineup with guitarist Mary Halvorson and drummer Ches Smith. That trio returned on Séances (2022, Pyroclastic Records), expanded by the chamber quartet Folie à Quatre — including Sleepytime Gorilla Museum violinist Carla Kihlstedt — for music inspired by the 18th-century French Convulsionnaires of Saint-Médard.

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The Sound That Ends Creation is the one-man experimental mathgrind project of Chris Dearing, based in Allen, Texas, launched in 2016 and citing Daughters, Psyopus, and See You Next Tuesday as key influences. The project has evolved from deathgrind/mathgrind roots toward incorporating big-band and orchestral elements, culminating in 2021's Boomers, Zoomers, Desperate Coomers, which Metal Injection called a 'jazzy mathgrind explosion' arguably closer to 'mathjazz.' Dearing layers piano into nearly every track alongside tapping-heavy, panic-chord guitar work, building a chaotic, carnival-like sound across eight-plus full-lengths.

Peculate is the solo avant-garde/progressive metal project of American composer Ben Norton, self-releasing everything for free since 2012 under a self-styled 'Metal in Opposition' banner. Norton fuses djent and mathcore aggression with 12-tone technique, Zappa-esque jazz-fusion tangents and polished production, occasionally detouring into satirical protest-song territory (2015's viral 'This Sick Beat™'). It reads as a bedroom-scale answer to the Zorn/Zappa strand of metal-adjacent avant-composition.

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LA duo of guitarist Lee Wanner and vocalist Paula Stefanini, active since 2012, fusing djent, jazz-fusion, blues and country into a genre-scrambling avant-garde metal project. Their two albums, Butterfly (2012) and Exocoetidae: Flying Fish (2013), pair death-metal vocal bursts with virtuosic, humor-laced composition. Guest musicians on Exocoetidae include prog drummers Morgan Ågren and Marco Minnemann.

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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