This discovery was brought to my attention by a professor in college as part of our building systems/ technologies class. Someday I'll plunk down the readies for the whole thing, but for now, this clip will suffice. Have a look at the photos to begin to have an idea of what's going on. Read the explanation to understand what's happening here. It's brilliant.
here's the meat of it:
"First, the four string players are introduced to the audience by a moderator - who may also be the sound projectionist. He briefly describes the technical aspects of the forthcoming performance. Then, the players walk to the helicopters - or are driven there - while being constantly followed by video cameras which transmit to the television monitors. The moderator (at the mixing console) explains over the loudspeakers what is happening.
From their embarkation into the helicopters until they disembark, each string player and his helicopter is transmitted via camera, television transmitter, three microphones and sound transmitters to his own group of monitors for the audience. Each string player should be constantly audible and always visible close-up – face, hands, bow, instrument – without any camera changes and without the fading in of other pictures.
Behind each player, the earth can be seen through the glass cockpit of the helicopter."