Hi Jesper,

If you simply want iTunes to find your music again, and are not  
worried about trying to recover playlists, then you can just use "Add  
to Library…" (Command-O) and point to your current iTunes Music folder  
(e.g., ~/Music/iTunes) as the folder to be added.

iTunes stores the database information for your Music library in two  
files under your user account.  On a Mac these are:
~/Music/iTunes/iTunes Library
~/Music/iTunes/iTunes Music Library.xml

The first file is a binary format file that iTunes works with.  The  
second (.xml) file is a version of the first file that third-party  
software programs can work with, that contains much (but not all) of  
the same information. When you first open iTunes, it will look for  
these files.  If they are not present, then iTunes will create these  
files (which will have no entries).  If you have a copy of the "iTunes  
Music Library.xml" file from a backup, you can force iTunes to rebuild  
its "iTunes Library" file with the contents of the "iTunes Music  
Library.xml" file by opening the newly created "iTunes Library" file  
in an editor like TextEdit, deleting everything, and then saving the  
file.  Note that it does not work to delete the file, since iTunes  
will just create a new version of this file, reflecting a blank  
library, the next time you open iTunes.   If you then replace the  
existing .xml file (i.e., "iTunes Music Library.xml") with your backup  
version (by deleting the newly created "iTunes Library.xml" file and  
copying your backup version to this directory), then the next time you  
open iTunes it will rebuild the "iTunes Library" file using the  
contents of your "iTunes Library.xml" file.  What this means is that  
all the information about your playcounts, ratings, playlists, etc.  
will be reconstructed.  The only thing that will different is that the  
information about the date the tracks were added to your library will  
be lost -- they will all show up as being added at the time you forced  
iTunes to rebuild its database.

This method only works well if the music tracks are in the same  
location as they were when you made the backup of your "iTunes Music  
Library.xml" file -- which does not appear to be the case here, since  
you've moved your tracks from the the external drive to Macintosh HD.   
However, if you really want your music tracks to be stored on your  
external drive, the tracks are still there, and you have an old copy  
of your "iTunes Music Library.xml", perhaps from a Time Machine  
backup, then you can use the method I outlined above to restore your  
library. Otherwise, it might be easiest to just use "Add to  
Library" (Command-O) and type or paste:
~/Music/iTunes/iTunes Music
into the dialog window prompt (assuming that is where you've copied  
your music).  Then iTunes will simply recreate the library data base  
when it adds your music.  You will lose the information on playlists  
and also playcounts and ratings, I think, but the other information  
will all be there.  It's possible to edit the backup "iTunes Music  
Library.xml" and use "Find and Replace" to change the file paths of  
all your music from the external to your current music location, but  
that can be rather tedious.  (Maybe somebody should write a script or  
automator workflow for this problem; it should be possible to shell  
script this easily enough.)  In any case, one of these solutions  
should work for you.

The easiest thing might be just to add all your current tracks on the  
Macintosh HD to your iTunes Library.  Make sure that these tracks are  
somewhere in your folder
~/Music/iTunes/iTunes Music
folder before you "Add to Library" with Command-O. It doesn't even  
matter if the tracks are not organized by structure of Artist and  
Album -- iTunes will reorganize this correctly from your tag  
information when it adds the tracks and move the files to the proper  
location within this directory.  The main point is that if you are  
adding your tracks from some other location, iTunes will copy versions  
to the "iTunes Music" folder when it adds the tracks, thus doubling  
the amount of space that is occupied.  This assumes that you have the  
default iTunes preference settings for the advanced pane of iTunes  
preferences with the boxes checked for "Keep iTunes Music folder  
organized" and "Copy files to iTunes Music folder when adding to  
Library".  You can check your settings by opening the preferences menu  
with Command-comma, and navigating to the "Advanced" pane, then  
reading the settings.

HTH. I can't test this in Snow Leopard, but this is how iTunes works  
in all previous versions so I assume this is accurate.

Cheers,

Esther


On Sep 11, 2009, Jesper Holten wrote:

>
> Hi there.
> Now the snowleopard is finally installed and I am almost happy if it  
> were
> not because itunes will not find  my music collection witch I have  
> copied
> back. iis the whole library structure under itunes that has been  
> copied from
> the external drive back onto mac hd. But something is afoot here,  
> and I fear
> I have messed up the whole of itunes?
> Please help me!
> Tbest regards, Jesper.
>


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