System of a Down

Fabulae Dramatis is a Colombian-Belgian progressive/avant-garde metal act founded in 2011 in Antwerp, Belgium by singer Isabel Restrepo (Medellín, Colombia), Daniel Díaz, and a member known as Hamlet. The band weaves classical, acoustic and ethnic instrumentation — including sitar, harmonium and tambura — into a progressive-metal base, with Restrepo shifting between metal screams, operatic vocals, growls and South American vocal traditions. Their 2024 album "Violenta" and its single "Fábula Violenta" dramatize Restrepo's childhood during Medellín's drug-war years, complete with a self-directed concept music video.

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Stolen Babies are an American experimental/avant-garde rock band formed in California in 2001, built around Dominique Lenore Persi's accordion and theatrical vocals in a 'dark cabaret' meets prog-metal frame. Twin brothers Rani and Gil Sharone anchor the rhythm section; influences include Oingo Boingo, Mr. Bungle and Fishbone. They released There Be Squabbles Ahead (2006) via No Comment/The End Records.

Acrylazea is a Rochester, NY avant-garde/progressive metal act (formed 2016) built around an interstellar-pirate concept, complete with invented stage personas (The Captain, Sirius J. Axion, The Eye, Professor V.V. Olfenstein, Byron Nova). Debut A Cavalcade of Cosmic Calamity (2021) fuses melodic death metal, folk metal, power metal and neoclassical shred, with guest vocals from Judas Priest's Tim "Ripper" Owens. Reviewers place it in the theatrical/conceptual-metal lineage of Unexpect and Vulture Industries rather than any straightforward extreme-metal subgenre.

Polkadot Cadaver is an American avant-garde/alternative metal band formed in Rockville, Maryland in 2007 by ex-members of Dog Fashion Disco, and stylistically a close continuation of that band. Their 'schizophrenic musical madness' shape-shifts between thrashing metal, folk-pop, experimental rock and darkly comedic theatricality across albums like Purgatory Dance Party, Sex Offender and Echoes Across the Hellscape. Clutch's Neil Fallon guested on their 2013 record.

Lies of the Machine were a Budapest, Hungary avant-garde/symphonic steampunk metal band, active 2013-2020, built around a concept world ruled by a 'Machine Lord' and blending symphonic and folk metal with industrial, thrash and cabaret elements. Their sole full-length, 'Freakshow' (2016), pairs clean vocals from Dauda Judit with the varied melodic/aggressive vocals of Buza 'Don' Balázs, and the band staged elaborate steampunk/circus ('psychocircus') live shows.

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Frore 5 Four is an instrumental avant-garde/progressive metal project from Canada, releasing a run of Bandcamp albums built around unusually prominent accordion. Reviewers describe the sound as 'stomping accordion polka weirdness juxtaposed to neoclassical harmonies' — vocal-free, structurally unpredictable, tonally caught between creepy and jovial.

God of Shamisen is a Santa Cruz, California band formed in late 2004 and led by Tsugaru-shamisen player Kevin Kmetz, billed as the world's first rock band to combine metal, funk, and progressive rock with the Tsugaru-shamisen, a fretless lute from Northern Japan. Its lineup features Kevin Kmetz (shamisen), Lee Smith (drums), Karl Schnaitter (guitar), and Mark Thornton (bass). The band shares members with experimental band Estradasphere: drummer Lee Smith moved to Santa Cruz in 2004 to join Estradasphere as their permanent drummer, and Kmetz also worked with the group. Their second album, Smoke Monster Attack (2010), was produced by Billy Anderson and Mark Thornton.

Angizia is an Austrian avant-garde/gothic metal act founded in Vienna in 1994 by Michael Haas (Engelke), built around theatrical, operetta-influenced concept albums often likened to a traveling circus or puppet theater. Their catalog, including the 'Russian trilogy' of Das Tagebuch der Hanna Anikin, Das Schachbrett des Trommelbuben Zacharias and 39 Jahre für den Leierkastenmann, fuses Central European folk and classical operetta with gothic/black metal texture. They have released on Napalm Records and Black Rose Productions.

Empalot were a French experimental band formed in the Landes in 1998 by Gojira's Joe and Mario Duplantier with friends from Joe's high-school thrash band. Self-described as "terroir metal," they welded alternative metal, jazz fusion, funk rock and avant-garde noise to burlesque, self-deprecating theatre, with members costumed as axes, clouds and flowers on stage. Conceived as the festive antithesis of Gojira, the group toured France between 1999 and 2004 and released a single studio album, Tous aux Cèpes (2002), before going on hiatus. The Duplantier brothers performed under the aliases Vensceslas Podoldo and Daniel Pestous.

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Ordkløver is a music-and-poetry project begun in 1999 by Düreforsög vocalist Boris Schiøler alongside bandmates Nis Bysted and Andreas Hauer-Jensen. Its sole release, Byen Buldrer ("The City Rumbles", 2005, Escho), pairs Schiøler's phonetic poetry with rock guitar and drums and an eight-voice choir, described by reviewers as sounding like "intoxicated monks and/or sea pirates."