I nearly fell off my chair when I read the announcement of these dates. On both previous occasions when I’ve seen the Peter Brötzmann Chicago Tentet it’s been at Porgy & Bess, the kind of spacious venue where you might expect this huge free jazz aggregation to play. But the tiny stage of the Blue Tomato, and the local Gasthaus Martinschlössl? Some mistake surely?

There was no mistake, of course. The first two of these nights saw the Tentet perform in various subgroups, while the last night saw the whole shebang come together for the kind of all-out aural assault in which this group specializes. The idea of subgroups made good sense for a couple of reasons. Firstly, these breakout groups are kind of fundamental to the ways of the Tentet, with their gigs flowing freely between full-on blats and quieter duo/trio sections. And secondly, there was no way that all eleven [sic] members of the Tentet were going to fit on the stage of the Tomato anyway.

Having said that, I did feel that the first night at the Blue Tomato could have got off to a more rip-roaring start. The first group on was the Brass Choir, consisting of Johannes Bauer and Jeb Bishop (both on trombone), Joe McPhee on a little trumpet (a pocket trumpet, apparently) and Per-Åke Holmlander on tuba. This was heavy going, with Bauer throwing his usual self-satisfied poses and a comparative lack of timbral variation adding to the monotony. The set dragged on for much too long, but things perked up soon after when Sonore (Brötzmann’s reeds trio with Ken Vandermark and Mats Gustafsson) took to the stage. Of course, lack of timbral variation is something you could equally well accuse Sonore of; but in their case it hardly matters when the music is as deliriously joyful and bouncy as this. McPhee re-emerged on sax to round off the evening, accompanied by the all-guns-blazing cello of Fred Lonberg-Holm and Michael Zerang’s rippling, surging percussion work.

The second night kicked off with Sonore sans Brötzmann, a wild and lusty duo in which Gustafsson and Vandermark gave full vent to the sheer physicality of their playing. It was dizzying stuff, and there was to be little respite as the great Paal Nilssen-Love sat down behind the kit, on this occasion across the stage from Jeb Bishop. Having developed a dislike for the trombone I didn’t particularly expect to enjoy this set, but Bishop convinced me with his flowing and disciplined approach to the instrument, the antithesis of Bauer’s tiresome flights of self-indulgence. Nilssen-Love, needless to say, was formidable.

I opted to skip the trio of Bauer, Holmlander and Lonberg-Holm in favour of some much-needed fresh air outside, and was able to exchange a few words with Brötzmann, who was also outside, smoking his way through an enormous cigar. Returning indoors, the saxophonist lined up his quartet with McPhee, Zerang and double bass player Kent Kessler, a group that has played together on many occasions but which I had never had the pleasure of catching before. It was a storming finale, the four of them perfectly attuned to each other as only great improvisers can be.

The appearance by the entire Tentet the following night at Martinschlössl was an extraordinary experience, and without a doubt one of my concerts of the year. I had never been to this joint before, and had little idea of what to expect; what I certainly had not banked on was the hall being filled with long wooden tables and the stage being barely big enough to contain the group (indeed, I believe it was specially extended for the occasion). What was even more unbelievable was the capacity audience, many of whom I had never seen before at places like the Blue Tomato or Porgy & Bess. As on so many previous occasions, I marvelled at the way normal people in Vienna – not trendies or hipsters, nor weirdy-beardy jazzers – turn out in their hundreds to listen to this loud, wordless, ecstatic music. There was even a girl of about ten in the audience, who seemed to be having a great time even though she did spend most of the evening with her hands over her ears.

As for the Tentet themselves, the thing that struck me was how badass they are. For all their smiles and outwardly friendly demeanour, these guys are a gang, and once they get onstage they mean business and are not to be f*cked with. Their music is like a juggernaut, destroying everything in its path with its blistering, volcanic energy. They are, as my son is fond of saying, deadly serious, and seriously deadly.