Sound art is hard to pin down. But that is part of the point. It challenges ideas of the the arts as separate classical entities.
The French sound artist Céleste Boursier-Mougenot explores the contours of artistic control through sound and random generation. For example in his work Index, he has designed a computer program to convert what is typed on office computers into a musical score. This is then played live by an acoustic piano in the same space. The program uses repetitions and nuances of the office work typing and creates notes, dynamics and other musical terms turning bureaucracy into music. The harder the humans work, the more music but the decisions are left to the computer.
And in the beautiful example below, the musicians are birds.
Céleste Boursier-Mougenot's zebra finches jamming at the Barbican Centre, London