The rise of a prominent auditory culture, reveals the degree to which sound art is lending definition to the 21st Century. And yet sound art still lacks related literature to compliment, and expand, the realm of practice. Background Noise sets out an historical overview, while at the same time shaping that history according to what sound art reveals - the dynamics of art to operate spatially, through media of reproduction and broadcast, and in relation to the intensities of communication and its contextual framework