Parasophisma

Opeth are a Stockholm band formed in 1990 who spent three decades welding death metal to 1970s progressive rock — Mikael Åkerfeldt growling over one riff and crooning over the next, with acoustic guitar, mellotron and knotty jazz-leaning chord changes given as much room as the heaviness. Steven Wilson's production on Blackwater Park (2001) and the entirely clean, mellotron-soaked Damnation (2003) pushed the prog half to the front, and by Heritage (2011) the growls were gone altogether in favour of jazz rock, Camel and Swedish folk. The Last Will and Testament (2024) brought the death vocals back after sixteen years inside a narrated 1920s will-reading concept record, with Jethro Tull's Ian Anderson on flute and narration. Theirs is the rare case where the experiment became the mainstream success, and the audience followed them into the strange parts anyway.

Akphaezya are a self-described 'eklektik metal' band from Orléans, France, active since 2002 and built around guitarist/concept-writer Stephan H. Zag-Zero's multi-album story arcs. Reviewers (French-Metal.com, Metal Archives) describe them freely mixing death metal, jazz, gothic, stoner, and cabaret/bal-musette elements, with critics drawing style comparisons to Unexpect, Diablo Swing Orchestra, and Pin-Up Went Down (no documented member/label overlap with those acts was found). Vocal duties have passed from the operatic, ethnically-inflected Nehl Aëlin to current singer Hakata Ooh.

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Grayceon are a San Francisco progressive-metal trio formed in 2005, built around Jackie Perez Gratz's electric cello and vocals alongside Max Doyle's guitar and Zack Farwell's drums, releasing through Vendlus and later Profound Lore on records such as All We Destroy (2011). The cello-forward lineup fuses thrash and doom heaviness with chamber-folk melody. Perez Gratz also plays in Giant Squid, with whom Grayceon shared a 2007 split, and has collaborated widely across the Bay Area scene, including with Neurosis.

Sanity Theorist is a DIY solo avant-garde/progressive death metal project based in Clermont, Florida, releasing free (donation-based) albums via Bandcamp since at least 2016, including Time Erosion, Escher Architecture, Ferrofluid Quicksand, and Existent Suffering. The composer's own bio describes progressive/death/funk metal roots layered with tribal Taiko drums, '70s prog rock, eastern folk, psychedelia, lead bass, jazz fusion, and neoclassical influences over extreme-metal rhythms. The same artist is also credited as a member of the multi-instrumentalist duo Refusal Knot.

Ehnahre is a Boston, Massachusetts experimental extreme metal ensemble formed in 2006 by former Kayo Dot members Ryan McGuire and John Carchia, fusing contemporary classical composition, aleatoric music, and doom/death metal extremity. The group avoids original lyrics, instead setting texts by modernist poets to dense, largely through-composed pieces built from extended technique and free improvisation.

Drainbow is the Austin, Texas one-man vehicle of multi-instrumentalist Nicholas Sarcophagus, who writes, performs and records everything himself. Its debut full-length 'The Tower of Flints' (2020) careens between thrash riffing, doom weight, gothic atmosphere, jazz-tinged lounge interludes and ambient post-metal passages inside a single kaleidoscopic record. It occupies the DIY, one-person-band corner of the avant-garde metal scene, prioritizing eclectic mood-shifting over any single subgenre identity.

Dagtum is a Filipino death metal trio from Pateros formed by veterans of the local extreme-metal underground, including Adam Carlo Along of Legion and brothers Ronaldo Jr. and Ronnel Vivo of Basalt Shrine. Their 2021 debut Revered Decadence (Eastbreath Records) folds dissonant, sludge-thickened death metal into jazz-inflected improvisation and creepy, horror-soundtrack atmosphere, drawing comparisons to Gorguts, Ulcerate and Portal.

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A Portuguese progressive death/doom act from Vila Real, active 1997-2011 (as Thanatos until 2001), that pushed from straightforward death metal into an increasingly atmospheric, doom-tinged and progressive direction across five albums. Dual male/female vocals (Guilhermino Martins and Patrícia Rodrigues) traded off over jazzy detours, Middle-Eastern-flavored guitar-and-keyboard passages, and dreamlike, trance-inducing keyboard textures, drawing comparisons to Porcupine Tree and Lacuna Coil before disbanding in 2011.

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Mastodon is an American heavy metal band formed in Atlanta in 2000, fusing sludge and stoner metal with progressive rock, hardcore aggression and jazz-influenced drumming into an ambitious, concept-driven sound. Their breakthrough Leviathan (2004), a song cycle built around Moby-Dick, established them as one of the most original and influential American metal bands of the 21st century, and later records like Crack the Skye (2009) pushed further into psychedelic prog territory. The classic four-piece held together for 25 years until guitarist Brent Hinds split with the band in March 2025 and died in a motorcycle accident that August; three of the four members trade lead vocals, giving the band its distinctive multi-voiced attack.

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Azure Emote is an avant-garde death metal project founded in New York in 2003 by illustrator/vocalist Mike Hrubovcak (Monstrosity, Vile) as an outlet 'to express personal negativity without the genre limitations often present within Extreme Metal.' Built around a core band with guitarist Ryan Moll, bassist Kelly Conlon, drummer Mike Heller and violinist Pete Johansen, the project layers in shifting rosters of guest musicians — female vocalists, saxophone, harmonica, keyboards — to give nearly every song its own distinct color. Releases including The Gravity of Impermanence (2013) and The Third Perspective (2020) have come out on Selfmadegod Records.