rock and roll music

Pop music is weird because it's about itself. How many rock songs are about how great rock music is? Or about being in a band, or playing the guitar or whatever. I wonder if this phenomenon is specific to pop music. I'm sure that there are exceptions, but genres like musical theatre or opera don't seem to like to call attention to the fact that they are singing (with exceptions like that fabulous episode of Buffy which is a great example of postmodernism's willingness to point out its medium), nor do "serious" art songs. To my knowledge, anyway.