For years I used iTunes to manage my music. I have a lot of data in a few different iTunes library files. I now use Sonos and so all of that metadata has been lost (ratings, date added, play count, etc.). I need someone to read in off of the iTunes database files, resolve duplicates as needed, find the matching song files on a hard drive, then overwrite the metadata in the files to contain the data in the iTunes library file. When done, all of my music files will have their relevant iTunes metadata encoded in the file. I can then use Clementine or another smart playlist maker to create playlists for Sonos based on the metadata in the files.