On the one hand I cannot make too many value judgments, because my own perspective cannot be too intrusive in the book. If I just reject whole genres and styles, or let my antipathy to particular recording artists prevail, then I am not doing justice to my subject matter.
On the other hand, one thing I am looking at is kitsch, the superficial, depthless, opportunistic response to Lorca. One particular example is quite nauseating. Other artists are interesting limit-cases, who could be seen as kitschy, or not, depending on the listener.