Really, pop music can't be art? And, for example, progressive music can be art? Who decides that? For me, pop music can be and is art. Brothers In Arms album from the 1980s was pop music. And for me, the BIA album is art.
I think you were right when you talked about music and the music business. I can go as far as to say that music is... Sport. Yeah, because it's a very physical activity. You bang shit, strum shit, sing until you're completely exhausted and you can't find an artist without a picture of them sweating all over the place on stage, even many classical musicians.
However, there's a physical element to the music, the muscle memory element, and a much more important element is the other part, where what you are doing is actually making people react, cry or dance. The first part is in sports, the second part is in art, it's as simple as that. It's yin and yang, stuff that's known since the beginning of time.