QUADVIUM, half in California – half in the Netherlands, is an instrumental progressive metal-fusion quartet that was founded by American bass player Steve Di Giorgio (TESTAMENT, DEATH) and Dutch bass player Jeroen Paul Thesseling both innovators in bringing a different style of fretless playing to metal. Launching a band with two predominantly multi-string fretless bass players is no common occurrence, and the bass-duo felt they needed to take very special and deliberate time to get the right alignment with who is participating and what will be the end result - meaning the right sound and composition to represent this rare vision.

Over time, together with Dutch master drummer Yuma van Eekelen (OUR OCEANS, former PESTILENCE) and American guitar virtuoso/ composer Eve (MYTH OF I, KAATHE) – whose contribution and expertise play a huge part of QUADVIUM – the music began to take shape. The line-up is just the right blend to mix the delicate balance of such a heavy aural offering and a full vocabulary of high level constructed pieces. QUADVIUM finished its long-awaited debut album, set to be released in 2025 via Agonia Records.