For many years I've stored the bulk of my music library on my PowerBook. Now I'd like to move this library to my (new) iMac. I don't want to try a drag-copy, since the iMac already has quite a lot of music on it already. I need to merge the libraries onto the iMac. The "Consolidate Library..." menu option in iTunes doesn't seem to come with much explanation, and the dialog box offers only a "Cancel" or "Consolidate" button and the ominous warning that this "Cannot be Undone." It isn't clear what happens if you click "Consolidate" and I certainly don't see any method for navigating to an iTunes library located on an external volume. Help isn't much help. How can I merge these libaries? Thanks!