Causa Sui is a Danish instrumental psych-rock band that has been crafting expansive, improvised, and often genre-defying soundscapes since their formation in the mid-2000s. The band consists of Jonas Munk on guitar, Jess Kahr on bass, Rasmus Rasmussen on keyboards, and Jakob Skøtt on drums. Causa Sui draws from a plethora of influences, ranging from classic rock to jazz fusion to psychedelic grooves, creating a unique blend of sounds that is both intensely hypnotic and dynamically fluid.

The band has built a formidable reputation for their vibrant and exploratory albums, as well as their mesmerizing live performances. With a discography that includes the "Summer Sessions" triptych, with each volume showcasing the band's ability to weave laid-back grooves and high-energy jams, and the "Pewt'r Sessions," which features collaborative jams with Ron Schneiderman of Sunburned Hand of the Man, Causa Sui has a prolific output that appeals to fans of free-form, instrumental music. Albums like "Euporie Tide" and "Return to Sky" highlight their knack for powerful, evocative compositions, while live albums such as "Live in Copenhagen" and "Live at Freak Valley" capture the spontaneous fire and chemistry of their on-stage performances. With "Szabodelico" and their most recent live album, "Loppen 2021," Causa Sui continue to solidify their place in the pantheon of contemporary psych-rock.