So the artwork under the artist tab in my music app had disappeared for some artists but not others. All the albums in my collection have artwork (shows in iTunes on my mac) and there doesn't appear to be any correlation between ones I've bought from iTunes and ones I imported from CDs... It is just the artwork under artist view that doesn't show up for some of the artists. The artwork in album view is fine. Any idea what went wrong and how I can fix this? (iPod touch 5th gen 32gb running 7.1.1) Thanks everyone!