Lemma 1 was the first performance experiment of the of the Global Visual Music project of Miller Puckette, Vibeke Sorensen and Rand Steiger. The concert took place on September 27, 1997 at the International Computer Music Conference and featured Steven Schick on drum set and George Lewis on trombone. George and Steve had small video cameras mounted on their hands, and microphones on their instruments, and they were on either side of a large video projection screen. The audio program was amplified through a quadraphonic speaker system. Puckette, Sorensen and Steiger ran the computers and associated video and audio devices.Our work is sponsored by a generous grant from the Intel Research Council.