I agree there is something wrong with this button. Without formalizing my thoughts until now I remember feeling disturbed by its presence because you pop your views, then expect to be at the top of the hierarchy of your library and then somewhat feeling contradicted by the presence of this button. Of course this is not a big deal, but it's a real inconvenience.
I agree, and I particularly agree with the point that your music is a subset of the world, and this back one more is the music store. My original thought on it was that you've reached the top of the hierarchy, so that button becomes free game for doing something else. If it were truly a dark pattern, it would have a back arrow and not just be a button.
