@klow – I disagree with you on your dismissal of the entirety of sound art. What you say about this type of sound being based more on texture than musical composition is true. It takes an open mind to appreciate and think about these types of artistic concepts. The article gets it right when it suggests that environment is important to and sometimes essential to a sound art installation.
For instance, David Tudor’s “Rainforest” was created and first performed within a sort of metal, resonant rain forest of objects that created the piece. The instruments were supposed to fit in space the same way that the sounds coming off of them do. When you experience and think about different sound art pieces this way, it becomes clear that sound art is indeed a form of art separate from conventional music with its own set of values and sonic possibilities.