i got a new computer, and downloaded itunes, i then put on all of my music from my old computer via a portable hard drive, all the songs went on to my itunes, but they all duplicated like 4 times, i know i can go through and delete them, but it takes so much time, i was doing it for about an hour and it made no difference, when i went on my computer again i swear the copies were back, any way i cant get my itunes to recognise they are copies and to delete them or something like that?