That said, if your library is huge and some of it is stored on an external drive (i.e.
you don't have room for all of your music files to be stored on a single volume), you are an exception and should not turn on the “Copy files to i Tunes Media...” feature.
Note that you have either a “i Tunes Media” or “i Tunes Music” folder in here.In File Advanced, you should allow i Tunes to Keep i Tunes Media folder organized and Copy files to i Tunes Media folder when adding to library.You don't need to do this, but it will make your life easier and will help prevent problems in the future.The first thing to note is that this method is drastic, and depending on the types of problems you have with your library, it's possible that you can end up worse off than when you began.
Thus I very strongly recommend that you back up your existing i Tunes folder before going any further, even if it's a mess.If you know that you had music stored in several different locations, you will want to repeat this step for each. and select the database file that you created in the “Export your library” step earlier.