I would take it to be about art in general rather than music specifically. It's socially acceptable for works of art to support a particular viewpoint - and try to convert their consumers to it - without supplying much evidence to show that it's actually true.

One example that will probably ring true with LWers is the strong lesson in lots of fiction that following one's "heart" is a better (more moral, or more likely to lead to success) course of action than following one's "head".