Bongripper is a four-piece Instrumental Sludge Metal band from Chicago, IL, United States.

Since 2005, they have self-released seven recordings. Known for a deafening and intense live performance, the band thrives on an unrelenting sound that can compete with any of the heaviest Metal bands of their genre, covering a vast range of genres, from Noise, Drone Doom, and Dark Ambient to Post-Metal, their music stands out as a great example of Experimental Metal.

Source: https://www.scaruffi.com/vol8/bongripp.html