And in reality, I don't have any of Licht. I have a documentary on the Helicopter Quartet, which forms part of one of the operas; yes, it's as the name suggests - the four members of the string quartet play in four helicopters flying above the concert hall, and their sound (and that of the 'copters) is radioed down to speakers. Sometimes I think that Stockhausen's life was devoted to trying to outdo Cage in breaking down preconceptions...