For some reason, iTunes 9 wont get rid of album art. I had it automatically download album art for my collection, but it picked a few bad images (most of my greatest-hits artwork is wrong, and a few compilations are wrong). I've deleted the images in the "Get info" part for each song, and the "Artwork" tab shows "No Image". However in the Cover Flow view on my iTunes and iPhone, the image still appears. How do I get rid of the image once and for all??? Or where can I find good album art to replace it with???