Monks. Not that Strawbs spin-off from the 1970s, the one from the mid-1960s formed by USAnian servicemen in Germany. Released one album before disappearing into almost-obscurity, but are endorsed by the likes of Jack White, Iggy Pop, Jello Biafra, Mark E. Smith-ah and Ade Blackburn ["Who he? – Ed.]*. Apparently they were influential in the development of Krautrock, though I can't hear it myself.
* frontman of creepy oddballs Clinic; sounds like he's singing through clenched teeth.