How To Duplicate Songs In A Playlist To Edit Info But Not Lose Original?

I'm making a Christmas playlist and want to edit the info on the various songs -- I'll add my own "album artwork" and will change the track info so each of the 25 songs is numbered 1 of 25 ... 25 or 25
bla bla bla
How best do I deal with the playlist so I can make my changes for this project but not lose the original info associated with each song? For example I'll want to add my artwork this time but want the original file to still have the original artwork, track number, album name, etc.
what's the easiest way?
Thanks

Wow ... a flurry of comment on what I thought was a basic question
Many thanks to all!
I am not aware of the "automatically add to iTunes" function -- is it a folder, a button, a menu item, ...? I don't see it in my iTunes and there is no mention when I did a search in the help. I'm sure it is right in front of my face.
What I was thinking of doing was dragging the songs to my desktop and then dragging back. But am I then going to get messed up with the file being recompressed?
Interesting stuff!
Thanks again.

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