Ross shows that the 20th-century, with the explosion in the world population, two world wars, consolidation of European countries, and emergence of third-world countries, alongside the political and economic hegemony of the United States, was also supremely a century of music. Musicians for the first time had access not only to centers of teaching, but also to mass audiences, particularly because of the invention of recording machines, starting with the phonograph cylinder to the present compact discs. Alongside this, musicians had access to a large number of listeners through radio, film, and then television. This meant that music, from its composition to its distribution, became an industry and was produced on an industrial scale. Audiences became not simply listeners, but consumers. I think that this is less a cause for worry and more a chance to broaden and deepen our understanding and experience. Music is increasingly available and much of it, in its performance, is of high quality. And what this book can help us resist is the deprivation that comes with anxiously sticking with what we know and only listening to what we believe we like.