This uses the iTunesLibrary framework or MusicKit to emit JSON representing the music library.
It can also emit SQL code for a database. itunes_json --itunes --sql-code | sqlite3 > /tmp/itunes.db Right now the schema is documented only in code. Then you can get information such as last playdates in order: SELECT s.name, a.name, p.date, p.delta FROM songs s, artists a, plays p WHERE s.artistid=a.id AND p.songid=s.id ORDER by p.date;
In Catalina, the iTunes Music Library.xml file no longer exists. My web generator program relied upon this. This code uses the library to create JSON for web generator to read.
In Sequoia, this must be run in an application bundle with permission to use the Music Library, or it will re-request Music Library permission on every launch.