Electroacoustic music, since its inception, has been situated in a cross-disciplinary no-man's-land, with areas of interest spread in many directions; from ideas of musical structures ordered through traditional pitch-classes to research on physical modelling and analysis of sound and compositional structures through the use of neural networks. Much of the material found in computer music has been developed through processes of appropriation, both from sound recordings of physical events and from the application of various principles found in the natural sciences.