"Kepler's Orrery is a generative music system that uses gravity equations to compose and play ambient music. Each simulation starts with a collection of bodies that attract each other, move, and swirl around under the influence of their mutual gravity.When the bodies collide, they make music. Each one is assigned a melody and an instrument and plays its next note at each collision.
Simulations are set up with "world" files that specify position, mass, and velocity for each body, as well as their melodies and instruments, and world metadata that defines simulation parameters such as step size, modifications to gravitational constants, etc.
The music it makes differs with each world. Sometimes slow and ambient; sometimes random, sharp, and surprising.
While the simulations are based on gravitational equations, and therefore deterministic, from a listener's point of view, it is difficult to predict what is going to happen next, and so the soundscapes tend to remain fresh."
http://www.art.net/~simran/GenerativeMusic/kepler.html
You can watch a video of Kepler's Orrery from before the iPhone here.
via Palm Sounds
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