A cappella choral Mongoloid

When I discovered this, I was hopeful that the band, Popchor Berlin, did other stuff in a similar style. Though they do tend toward some quite suave choral covers, this is the only one I've found that's a cappella.

Their 2002 release, 1 (their follow-up was 2) has two versions of Devo's "Mongoloid." Here's the unaccompanied version: