Catalina import Library.xml into music app?

Solution 1:

According to turingtest2 on Apple Support forums, you might be able to import the XML using the 'Import Playlist' function.

The XML file is for third party support. The active iTunes library would normally have been called iTunes Library.itl though in some legacy systems the .itl extension might be omitted. You can hold down option while starting Music (or TV) and then use the Choose Library option to access an existing .itl file. You will be prompted for the path to store a new music (or TV) library converted from the old one. Alternatively you can use File > Library > Import Playlist... to import an XML file, but that will lose date added information that would be preserved by working with the .itl file. Either method should bring in ratings and playlists.

https://discussions.apple.com/thread/250869304