Re: damaged songs library
I can't comment on why iTunes did what it did. All I know is that it didn't happen with me when I imported the mp3's i my Music folder into it. Maybe it's a setting for the import (I didn't check, however, if such a setting exists).
The best thing you can do is to restore that "certain directory" from your backup. Then everything will be as it was and you can delete the MUSIC library created by iTunes.
As should be well known, not having a backup of data implies the owner doesn't mind to lose them. The only 2 good reasons for that are:
- it's less work to create them again then to make a backup (or less money than buying a external disk for the backup copy)
- they are absolutely worthless for you, you'll never need them again
Alas, we find that some of our members learn this too late.