
"For decades, musicians have been experimenting and working with electronic synthesizers to generate sound. In some cases the reasoning is logistical - often it is prohibitively expensive, for example, to haul a heavy and expensive piano or organ to a venue. Many times, however, the goal is creative expression in the generation of new and previously unheard or unharnessed sounds. Chaotic oscillators, including the example discovered by Leon Chua, open the door to a new universe of sonic possibilities.
Chua's oscillator is a system described by a set of three differential equations that can be realized either in digital form or in analog form using opamps and passive circuit components, simple in appearance, but extraordinarily complex in its analysis and behavior."
Title link takes you to more info including a video