Twenty years ago, Underworld made dubnobasswithmyheadman, on which they first emerged as a techno powerhouse. Now, for that milestone album’s anniversary, the group is reissuing the record in a lavish 5-disc box set featuring a ton of unreleased material. In anticipation of that, they’ve released the previously unheard demo “Birdstar,” which cycles through the kind of psychedelic house and techno that made them so legendary to begin with. Check it out below.

dubnobasswithmyheadman is out 10/6 and can be pre-ordered through the band’s website.