I'm really glad I made the trip. Thanks to buying my ticket the day they went on sale, I was seated in the first row, about five feet behind Subotnick. An iPhone shot of his performance rig is attached. I took this shot from my seat, without having to zoom in.
Crowds and Power was a powerful piece. Joan La Barbara sang the vocal part. The synthesizer part matched her vocals in fascinating ways. I'm not sure whether her voice was a modulation source, or whether Subotnick was explicitly playing along. I know that he's employed "voice as modulation source" techniques before, so it would be interesting to find out how this effect was done.
Strangely, the last few minutes of Crowds and Power ended with the last few minutes of A Sky of Cloudless Sulphur, but with the addition of a part for La Barbara.
The performance of Silver Apples of the Moon was nice, as well. It was a bit different than on the original album version, but all of the familiar sounds and rhythms were there.
Can anyone identify the three pieces of equipment surrounding the MacBook? The silver thing to the left, the white thing in the middle, and the black thing to the right, in front of the 222e?