Quadvium

Quadvium is an instrumental progressive metal and jazz fusion quartet formed by renowned fretless bassists Steve Di Giorgio (Testament, Death, Autopsy, Control Denied) and Jeroen Paul Thesseling (Obscura, Pestilence). The band, founded in late 2019, features a lineup that also includes guitarist Eve and drummer Yuma van Eekelen, creating a unique, bass-driven sound that blends technical death metal influences with expansive jazz-fusion textures. Their debut album, *Tetradōm*, was released on May 30, 2025, via Agonia Records, and is celebrated for its intricate compositions and the mesmerizing interplay between the two fretless basses, which sit at the heart of each track.

Known for tracks like "Apophis," "Náströnd," and the album *Tetradōm*, Quadvium’s music is an adventurous journey through labyrinthine instrumental passages, technical precision, and smooth, jazzy chord changes, appealing to fans of bands like Atheist, Cynic, and The Omnific. The group’s vision is focused on pushing the boundaries of what fretless bass can do in a metal context, resulting in a sound that’s both aggressive and ethereal, with strong nods to both 90s tech-death and modern fusion prog.

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