There are 15 musicians sitting on both sides of the stage: 15 guys with hammers banging on some xylophone-type things on the right, and 15 flutes and stringed thingys and more xylophones on the left. All are sitting on the floor cross-legged, banging their instruments together. There is a pattern but I don't get it. The sound is like a bunch of bamboo xylophones being banged at various pitches at the same time. Not much range. But it's not haphazard - there is a pattern and they are all doing the same thing at the same time.