To me they are virtually inseparable. The music will be the first thing that catches my attention but poor SQ can draw my attention to the wrong place and change the feel of the song or become a distraction to the song. To me SQ is like looking at a panoramic view through a screen or a smudged window, you can see what is on the other side but it lacks clarity and detail and is just not as satisfying as looking through clean clear glass.
I have found it interesting when I have heard some songs that I disliked in the past and after hearing them again with much improved SQ, I have found myself appreciating much more what the artists was doing and in some cases even liking the song.