I would agree that "listening to music and appreciating music isn't exclusive to musicians," but I'm not sure I completely agree with "nor is our opinion on it more valid than anyone else out there listening to it"
I can appreciate the stars just as much as an astrophysicist. OTOH, the astrophysicists opinion on matters of astralphysics should rightly hold more weight than mine, because the physicist spends a lot more time studying and learning about physics than I do.
I think the better statement would be "nor is our ENJOYMENT of it more valid than anyone else out there listening to it."
Anyone can feel free to listen to haphazardly constructed, mindless , drivel.... but it's still haphazardly constructed, mindless, and drivel.