I'm sure this has been addressed before but I searched and couldn't find anything so if anyone has a link to a post that answers this could they please let me know or just tell me how to fix it please?

anyway, i transfered all my music from itunes on my old pc to my new mac; i did it the way it says on apples' web site. when i finished, on my ipod capactiy meter it says 3.88gb of audio, and 3.9gb of other. What is this other? im guessing somehow it duplicated what was on my ipod except in my mac itunes library there only my main set of music and no duplicates, same when i look at my library on my ipod. So does anyone know how i can remove this "other" stuff on my ipod? Thanks for your help!