I recently started using Last FM. I opened up Last FM on its "Now Playing" tab. It showed the artwork for "Back in Black". I clicked on it and it opened the Last FM in Firefox. I then right-clicked on "Hells Bells" in iTunes and selected "Get Info" and then the Artwork tab. I grabbed the artwork from Firefox and dragged it to the Artwork on iTunes, and somewhat surprisingly it just worked. Now I have artwork for any of my songs from "Back in Black." There could have been a few less clicks in the process, but it was still pretty intuitive and worked really well.
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