This is a slight variation on KronoS above but I might suggest the following as a last resort:
This is assuming that you have previously allowed iTunes to organize your Music such that you have a well formed iTunes music tree (i.e. on a Mac,
~/Music/iTunes and delete the following files:
iTunes Music Library.xml
iTunes Library Genius.itdb
iTunes Library Extras.itdb
- Any other very similar
* Music Library * files in that directory which look to be backups.
At this point you should have got rid of all the extra linking which is causing all your problems.
Once this is complete - you can try the following:
- Start iTunes as normal.
- At this point the list of music in iTunes should be blank.
- Inside iTunes go
File > Add to Library and select
This should reimport all your music with only a single entry per file.
WARNING: This method will kill off all your podcast subscriptions, playlists and possibly album art and should only be used as a last resort.