If you look at the top celebs on Facebook, the appetite for musicians is endless: scattered athletes and actors cower in the shadow of pop stars living and dead, G and B among them. So perhaps pop music is becoming like comics—a minor artform, fiercely loved by enthusiasts but nugatory in revenue terms, whose real value lies in powering something else. What comics IP does for the film industry, pop does for the celebrity biz—provide a stream of garish, blockbuster characters and never mind the source material.