I went to this, and it was quite wrong.
british sea power's 'contribution' was kept to a minimum- essentially they banged some stuff in the corner anf then were ushered off by the bearded chap after 5 minutes with 'thank you british sea powers!' similarly (if more enjoyably) the pipettes' contribution was to scream through one song and hum loomingly through another. also there was a marching band marching variously on the stage and through the audience, which was fun- particularly when a trumpet at the front was answered by a french horn at the back of the hall. other than that it was much as you'd expect- power tools, metal sheets as percussion, rather embarassing hippy proclamations ('you are the people of the moon!' 'listen to the fish!' etc) and ah, the 'hits', among which the instrumental thingy off Faust IV was most propulsive, inducing some dancing.
points off tho for jean-herve peron's tendency to declamation, which made 'it's a bit of a pain' resemble whitehouse remixing counting crows.
fun though.