I have 2 computers with different iTunes libraries which repeat many of the same albums, but also contain many unique albums not in the other library. I want to combine the libraries onto a single computer, but I want iTunes to add just the songs which it doesn't already contain, because I don't want it to reanalyze my entire library over again which takes forever. Is there a way I can drag and drop a whole folder full of albums onto iTunes and have it just add the songs which don't already exist? I have way too many albums for me to sort by hand which already exist and which don't. Possible?