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Dec 3, 2013 7:14 AM in response to horsyjby pedro d,Hello there, Horsyj.
The folllowing Knowledge Base article provides some great information about what iTunes Library files contain what information:
iTunes: What are the iTunes library files?
http://support.apple.com/kb/HT1660
This may be particularly relevant for you:
About the iTunes Library.itl file
This file is a database of the songs in your library and the playlists you've created. Some song-specific data is saved in this file. If you delete the file, iTunes creates a new, empty copy when you open the application, but any playlists, song ratings, comments, or other information you created is lost. The iTunes Library file is only used by iTunes, and is the only one backed up by Time Machine on OS X.
Note: The library file name for versions of iTunes for Mac prior to iTunes 10.4 was iTunes Library with no file extension.
Tip: New versions of iTunes sometimes include enhancements to the iTunes library. When you open the new version of iTunes, iTunes upgrades your existing library to the new format and places a copy of the old library in the Previous Libraries folder. If everything goes fine during your upgrade to the latest version of iTunes, you can delete the older iTunes Library files.
Thanks for reaching out to Apple Suport Communities.
Cheers,
Pedro.
