I've already explained the role of the audience. The special thing about rock music is it's nearly unique ability to document the human experience because sound operates below the consciousness of human beings. It is a language that speaks in the same language as human consciousness. No other medium has these capabilities. Some can make an argument for film but film relies on visual images.
Visual information is useless.
I guess this comes back to the Platonic question. Because otherwise we live in a swampland where everything is true. When everything is true nothing is true. I am dumbfounded by this question. Well, I think you already answered it.