Great Underground Documentary

I don't know if anyone has posted this link or seen it, but today I watched an excellent rock documentary called Such Hawks Such Hounds which as it says "explores the music and musicians of the American hard rock underground circa 1970-2007, focusing on the psychedelic and '70s proto-metal-derived styles that have in recent years formed a rich body of unclassifiable sounds." Enjoy, I know a few people who will really dig this: