This will show you how to force iTunes to re-scan your library to fix missing metadata by re-scanning all your music files. You can re-fresh individual files by playing them in iTunes. If you have used an external program to change data and you don’t want to have to play each song to get it to update then this post will show you how.
iTunes will then re-add all the files you already have to you library. iTunes wont create duplicates. Rather, it will re-scan each file and will alter the metadata for the existing entries in your library. This process can take a very long time – when I last did it I had to re-start the process multiple times for it to eventually complete. When you re-start the importing, the import starts from the very beginning again :(
If the above doesn’t work, then some people have suggested deleting your library file, and creating a new one;
this can be very time consuming if you have a lot of music –
the basic steps are
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