I have searched extensively for this and not found the perfect answer, so apologies! I have a 250GB External Drive which holds my roughly 100GB iTunes Library plus some other stuff. I am going to be moving back and forth with my MBP more often now and would like to use the Multiple Libraries feature of iTunes to create a library of, say, 30GB of songs which I want to store on my laptop. When I am at home I would select the external (larger) of the two libraries. Exactly how do I achieve this? I have tried copying 20 or so songs to my laptop, creating a new library and adding them to iTunes, but all this does is create duplicate copies of the songs on my external drive, when I want that library to be specific to my laptop hard disk. What am I doing wrong? Thanks in advance!