Bad Music

Why are some popular musical forms and performers universally reviled by critics and ignored by scholars-despite enjoying large-scale popularity?  How has the notion of what makes "good" or "bad" music changed over the years-and what does this tell us about the writers who have assigned these tags to different musical genres?  Many composers that are today part of the classical "canon" were greeted initially by bad reviews.  Similarly, jazz, country, and pop musics were all once r