QUADVIUM is an instrumental progressive metal-fusion quartet that seamlessly blends technical precision with profound musicality. The band was founded in late 2019 by American bassist Steve Di Giorgio (known for his work with Testament and Death) and Dutch bassist Jeroen Paul Thesseling (associated with Obscura and Pestilence), both pioneers in introducing fretless bass techniques to metal. They are joined by Dutch drummer Yuma van Eekelen (Our Oceans, Pestilence) and American guitarist and composer Eve (Myth Of I, Kaathe).