Moving Itunes library to Rhythmbox - song/album/genre info?

Hi

I have a huge music library that I entered on Itunes on my last OS (before getting Ubuntu), and on Itunes all my music had all the info with it (track, album, genre, artist... etc). But now that I am moving them into Rhythmbox, most of them are getting listed as unknown in all these categories, and only the file name is being retained. I was wondering if there is some way to retrieve this information, because I suspect it is attached to the tracks.

I was hoping I wouldn't have to go online and somehow retrieve the information, because I know it is already there, but I will do what I have to do.

I aplogize in advance if this question has already been answered, I suspect it has, but I tried a few searches and couldn't find what I was looking for. I probably don't know the terminology.

Thanks for your time and your help in advance!
-Don