In my review of a concert by Fire Room last year, I bemoaned the fact that there is hardly any crossover between the scenes at the Rhiz and the Blue Tomato, Vienna’s kindred temples to electronic music and free jazz. The observation is no less valid now than it was a year ago. Despite the genial management of Herbie and Günter respectively, and despite the many obvious similarities between these styles of music, it’s rare to see either artists or audience members from one place showing up at the other. So it was a great pleasure to see Mats Gustafsson, who along with people like Ken Vandermark and Paal Nilssen-Love is by now part of the furniture at the Tomato, turning up for what I believe was his first ever appearance at the Rhiz. The gig cemented an association with Austrian guitarist Martin Siewert that goes back to at least last summer, when Siewert’s Heaven And played the closing set at the Gustafsson-curated Konfrontationen festival, and was bolstered last December when the saxophonist joined Siewert for a frenzied blowout at Heaven And’s gig at the Künstlerhaus.

There’s clearly an affinity between the two, then, and it’s fascinating to hear how Gustafsson responds to the presence of another, very different-sounding, lead instrument as opposed to the rhythmic core of double bass and drums he lines up against in The Thing and other groups. On this occasion the duo were joined by turntable and electronics merchant Dieter Kovačič (dieb13), whose malevolent drone-based activity formed a disquieting accompaniment to the guitar and reeds. It was a short set, only 40 minutes or so, but there was still a vast amount going on here. Gustafsson spent most of the set on the deep, resonant baritone sax, switching occasionally to the rare slide sax. Throwing himself into the performance with his usual relish, Gustafsson made the Rhiz his own, challenged only by the endlessly vital and inventive guitar work of Siewert. The guitarist was, as ever, a joy to watch as he moved fluidly between acoustic, electric and tabletop modes; he peels off sheets of squally, thunderous attack with the deranged instinct of Robert Fripp, but trades Fripp’s frosty demeanour for a wholly persuasive openness and sense of fun.

Just over a week later, Gustafsson was the unannounced surprise guest at a gig at the Blue Tomato by the Frode Gjerstad Trio, an all-Norwegian unit consisting of the eponymous Gjerstad on reeds, Jon Rune Strom on double bass and the ubiquitous Paal Nilssen-Love on drums. The first set consisted of the trio only, and it was a pleasure for me to hear Gjerstad play for the first time. Less cerebral than Vandermark, less visceral than Gustafsson or Brötzmann, the saxophonist eschewed a barnstorming approach in favour of clear, ringing lines on alto and clarinet that allowed the bass and drums plenty of space to work their magic. Nilssen-Love’s complex polyrhythms were as brilliant as ever, while Strom was a constantly forceful presence on the low end.

After the interval Gustafsson took up his tenor and Gjerstad immediately deferred to the guest, who laid waste to the room with a long and devastating solo. Things never really let up from that point on. The two reedsmen’s techniques and registers complemented each other beautifully, with Gjerstad’s light and nimble colourations set off against Gustafsson’s fearsomely powerful mid-range assault. This was my last visit to the Tomato before their well-deserved summer break; I’m sure, though, that there will be plenty more such mesmerizing evenings before 2011 is out.