I would say that this is a good indirect argument for democracy; by pooling raters' opinions, a compromise that wasn't too horrible was arrived at. Of course, democracy won't produce Bach, but it will also not produce something as horrible as Schoenberg.
The coverage of this paper in Science NOW has sample audio.
PNAS doi: 10.1073/pnas.1203182109
Evolution of music by public choice
Robert M. MacCallum et al.
Music evolves as composers, performers, and consumers favor some musical variants over others. To investigate the role of consumer selection, we constructed a Darwinian music engine consisting of a population of short audio loops that sexually reproduce and mutate. This population evolved for 2,513 generations under the selective influence of 6,931 consumers who rated the loops’ aesthetic qualities. We found that the loops quickly evolved into music attributable, in part, to the evolution of aesthetically pleasing chords and rhythms. Later, however, evolution slowed. Applying the Price equation, a general description of evolutionary processes, we found that this stasis was mostly attributable to a decrease in the fidelity of transmission. Our experiment shows how cultural dynamics can be explained in terms of competing evolutionary forces.