There is an option in the itunes preferences panel that copies all audio files put into it into its special itunes folder. Then, the files that are added to playlists and such are not the ones you put in, but the ones that are now copied to the itunes. You can turn off the option, and delete the itunes files, but be warned that every single file in your library in itunes will not exist and your playlists will not work. It's a hassle, but then you can add all your songs back into itunes from their original LW shared location.

It's a horrible option in itunes, and the default is on. Really a pain. I had about 6-7GB of music that the thing copied, quite inconveinant. But, I did the above, and all is well now.