Copy Tag Info Tracks to Tracks *does* transfer Play Count and Rating (and Song Name, Artist, Album, Album Artist, Composer, Grouping, Last Played Date, Artwork, Genre, Comments, and Year). But you are correct: iTunes manages Date Added and there is no way to manipulate that with AppleScript.

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Doug's AppleScripts for iTunes
dougscripts.com

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The most important thing that this keeps is the playlist information, which none of the other solutions do.

I've done this hint countless times (just figured it was something everyone did) and can confirm that it works well--just a bit slow. I've worked on automating this before, but never been able to find a satisfactory solution. If Apple made the location property of the track read-write (instead of read-only) this would be dead simple.

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