Yep - always enjoyed a quality weekend in my dickie bow round Hermann's gaff, sipping cognac with the prime minister of Andorra's daughter while Hermann sprayed us with BSE and black pudding.
To be honest though, I always felt his early recordings lacked the offal-splattered mayhem promised by the insane covers. A lot of those really rare vinyl releases that go for stupid money have superb, menacing, OTT artwork but are sonically dull over the course of 30+ mins - or, at best, never quite lived up to expectations.
His 'masterpiece' is probably 'Island' - think you can grab the 4xCD set for under £25 on Discogs. It pretty much contains all of Nitsch's standard Live Aktion moves: livestock moaning, long droning brass sections, proto-Whitehouse high-pitched whistling, jolting drum thuds, sudden excursions into oompa music, sections of cable/amp hum, etc. Put it this way, he didn't 'vary' styles much in a live setting. There's not a massive world of difference between that release and 'Musik Der 60 Aktion', which features a 'punk band' (PVC, from Germany) - not that you'd be able to tell.
His first proper vinyl outing, "Akustisches Abreaktionsspiel", is a real oddity worth hearing (via torrents, unless you're spectacularly flush this month) - mainly people screaming their heads off and oompa band nonsense, with an Austrian radio presenter cutting in and out and 'explaining' what's going on. Proper 'art nutter' release, though perhaps less droney than the later, numbered 'Aktion' stuff.
That Harmoniumwerk 1-4 CD you posted is also pretty lovely. I don't think you need to track down the other volumes though. He recorded something like 1,000 hours' worth of harmonium drone, fuck knows how much of it has been released since, but I think Cortical Foundation put out another three double-CDs of that stuff.
Oh, and off the beaten track, but, somewhere, perhaps on a corrupted hard drive, there's evidence of me and Kek-W (from Kid Shirt) doing a hardcore gabba track called 'Hermann Nitsch's House' and screaming SPRINGTIME FOR DEWHURST and DRONE WAR IN KEBABHAUS!! like lunatics, plus some unpleasant text regarding Babsi from 'Christiane F'
I should have known youd be a fan.
Got about 12 vols of Harmoniumwerk from Ubu web, the other stuff Ive heard seems like a mix of semi-classical and concrete style experimentation, as you say.
Did he have any direct relationship with the industrial/postpunk/weirdo scenes, or was he more of a titular figurehead or fringe figure?
He's such a ridiculous figure - like something from a Vic and Bob sketch or a bad horror film. There's a story about him doing a gig in Paris on the same bill as Charlemagne Palestine and getting so annoyed that the press mixed up the names/photos afterwards that he refused to speak to him again for decades.
When can we hear this lost BTI/Kek masterpiece?