Norwegian dance duo Röyksopp operate in the sector where people come to blows over whether something should be called "chill-out" or "glaciated ambient". Yet here they are at this horribly sweaty show, being cheered by real people as well as twits who burble about the pair's remixes.

Most of the sardines gamely shuffle-dancing at Koko look as if their last album purchase was Coldplay, so it's safe to assume that Röyksopp have crossed over into the wider consciousness. Half a million UK sales of their 2001 debut album, Melody AM, testify to that. Svein Berge and Torbjorn Brundtland owe it to their skill at creating music fit for the better sort of airport lounge. Imagine the trickling electronica of Gallic band Air pumped up with manly Viking horns - that's Röyksopp.

At least, that's Röyksopp at Koko, where extreme humidity calls for an aggressive tone to combat heat exhaustion (even so, people keep retreating to the foyer to drink water listlessly). What comes across on album as space-age jiggliness assumes an altogether more macho edge on stage, fleshed out by the higher volume and the pair's ravenous playing: one wildly jabs a keyboard, the other beats a computerised drum into submission with sticks. You'd never guess that these Nordic alpha males are the people behind the puppyish radio hit Eple - which, here, grows fangs and becomes a Rottweiler.

The illusion of a smash-and-grab raid is only dispelled when the percussionist makes a fey foray into singing tracks from the new album, The Understanding. He is far less macho than the sequin-vested female vocalist who accompanies him on Circuit Breaker, and leaves the stage laughing. Thus, a pleasantly contradictory evening with middle-youth's new favourite band.