I copied my iTunes folder and changed it in preferences. Then I did Library -> Organize Library. Why doesn't iTunes see the music? (I think I used this process before).
How to fix?
Using iTunes 10.
What you should have done is hold the ⌥-key while starting iTunes and it will prompt you to choose a new library which is the
iTunes Library.itl inside the iTunes folder you wanted to copy. If you still have a copy of the old folder, do the above. Otherwise, I think you just created a new library with 0 songs.