The other afternoon I was cleaning up my iTunes Library, deleting all my album artwork because I had forgotten to use the "Get Album Artwork" button, lol. Well anyway, as I was re-downloading album artwork I noticed that one of the albums I purchased from the iTunes Store (and did not change any of the details for), iTunes could not find the album artwork for. I searched for the album on the iTunes Store and it was no where to be found. I paid my $9.99 for this album, but since it's not in the iTunes Store anymore, what happens if I were to need to download it again given something catastrophic happened to my PC? 
