Empirical applications for assessing the efficiency in cultural organizations are still scarce. In this paper, we use a non-radial, output-oriented, DEA model for assessing the efficiency of a sample of 292 Musical Societies in the Valencian Community. The interest in this type of cultural organization lies in both its socio-economic relevance and its degree of territoriality. The achieved results show that the average efficiency of the Musical Societies stands at 72.66% and points out to the existence of certain specificities in the supply and demand for provincial markets in which they operate.