I have an external HD which has my iTune library. Somehow I cannot put that external HD's iTune Libara on iTune on my 15" Al PB. I already tinkered with the preference section by making my iTune libarary default to that external HD. The content of that external HD is prior to the erase and install I did for my Al PB. I would like to keep my music libaray on the external HD so that I don't overwhelm PB's Hard Drive.