Change playlist art on an ipad in iTunes 11

[class77]

Yesterday, I bought several songs from the TV show Nashville and decided to put them in a playlist. Everything went fine until I saw the cover art that had been assigned to the playlist. The album cover shown was for a group called AM 60 "Big As the Sky".

I'm totally at a loss for what to do because neither this song nor anything in the album was EVER IN THIS PLAYLIST, so I don't know how to get rid of it. I deleted the playlist and added a new one with the same name and it came right back. I even deleted the song from my library and the cover art is still there. How do I remove the Big as the Sky cover art to get to the Nashville art underneath?

PS-Anybody figure out how to replace missing cover art for about 1/2 my albums that was there in iTunes 10?