The history of music in the twentieth century is viewed as a process of expanding the sonic material of music to include all sound. Technological barriers to the full exploitation of the domain of sound are suggested as causing the process to take more time than it would otherwise due to cultural or aesthetic factors alone. Important historical developments in music over the last century are reconsidered to be, at least in part, strategies for circumventing technological limitations to manipulating and accessing all sound. Support for this perspective is found in the words of artists and composers of the time and in comparisons between the technologies available for creation in the visual and the sonic arts. Sound modelling is examined as a post all-sound paradigm holding promise for normalising the relationship between sound and music.