<b>Notiusweb:</b> Personally I would have put tags in the files for 'Smart Content'. On a bad day, you can simply rescan to regenerate your database, and that would work even if you mangled the directories 4 years ago because that is what Daz told you to do back then.
The solution Daz has chosen was creating another database with a cross dependency to the files to another list of files in another location, so nothing can change, and you need to become a professional database manager.
I need a full reinstall of everything I own to do what daz has now officially and needlessly changed its mind to.
FYI, this is how I sort my MP3 Files. All music is sorted, Genre\Artist\Album\Track - Song. Those are the tags as well as the file names. My database works with all known music players. I started doing this after multiple database crashes in Windows, and the fact that editing a database in a program didn't help me find or clean up files. (I use a program called MP3Tag to make all this happen http://www.mp3tag.de/en/.)