Five computers are in a room. They all run a program that produces sound. The programs function in a loop. First the program records the ambient sounds using the computer's microphone for a few seconds. Then the recorded audio is reinterpreted into music notes and rythm. Finally, the reinterpreted melody is played, and the program loops back to the beginning.
The resulting "music" that the five computers play together is a constant reinterpretation of itself. It is both a product of its environment, and its previous state.