iT Library Clinic

Library Clinic is an iTunes® library assistant used to edit and manipulate the tag content and file locations of files listed in the iTunes XML library file. It offers a more powerful and versatile tag editor and file renamer than corresponding functions found in iTunes itself, and makes it easy to move specific files, or even a whole library, to another location without confusing iTunes. You can use it to make multiple, alternative versions of a library and then activate any one you want at any particular time. You can catch-up a library with tag changes, or vice versa, with just a single mouse click, and it contains an integrated playlist editor.

Library Clinic doesn't work directly on the iTunes library itself, but instead works on a copy of it in memory. Changes you make are not applied to the actual library until you tell it to, or until you allow it to. When changes are applied, a backup of the original library is created which can be restored at any time.

Most people are aware that iTunes keeps two copies of its library. The first is a compressed volume called "iTunes Library.itl," and this is the copy that iTunes actually uses and works from. The second copy is a backup of the first, a copy that is stored in human-readable XML format, in a file named "iTunes Music Library.xml." This program operates only on this second file and takes advantage of iTunes' willingness to load from this backup copy if the primary file, the compressed copy, is found to be unusable.