The seven-day, 26-hour avant-garde behemoth requires not only vocal and instrumental soloists, choir, orchestra, ballet dancers, and electronics, but four helicopters as well. (Yes, the notorious “Helicopter Quartet” is from LICHT.) The Dutch, being practical folk, have now devised a smaller-scale adaptation: aus LICHT, which runs a mere 15 hours of music over three days. Reporter Simon Cummings finds out how they did it (and convinced the famously controlling Stockhausen Foundation to cooperate).