For a while now, my iPod has been slowly, but surely, mixing up all of the album art on my music (for example, Come Together by the Beatles displays the art for Cinema by Benny Benassi). At first, it was just a few songs, but now, almost every song by every artist is wrong. I tried removing all of my music, but since one past update, all of my purchases still show up in the music app, and even those have wrong album art. The thing is, everything is correct in iTunes on my laptop. How do I fix the songs that I am completely unable to erase off my iPod?