Hi. I just got iOS7 and noticed that the music player now adds an image for each individual artist. I've seen screenshots of this, but for me, most of my artists have blank gray squares next to them. One of them does have art, but the artist just has two songs under them and it just uses the cover art for one if the songs. But I also have other artists with one or two songs under them, and they have the blank squares. Is there any way to manually edit the art that shows up when viewing by artist? Just to note: all of my album art work shows up when I pick the actual song, and that most of my stuff has custom tags (which I'm assuming is the problem).