I wanted to share the following, which solved a big problem for me.
I have tons of songs in my iTunes library, and I didn't want to
stop using mp3TAG.
However I couldn't seem to find a way to get the mp3TAG updates
into the iTUNES library, except for deleting and adding all songs again.
Here's the solution how to update the iTunes library with minimum effort in one go:
Highlight all tracks in the library and right click and select "Get Info."
(BE SURE NOT TO CHECK ANY OF THE FIELDS IN THE DIALOG
OR YOU WILL LOSE THE VALUE FOR EVERY FILE).
Then click OK
After doing this, the files are all processed and the tag changes are picked up.
The playcounts remain the same.
Hope this is useful to somebody