make sure on your system that 'show all hidden files' is ticked in the properties box
go to start>my computer>ipod>ipod_control>music and all the music files are in there
just import them to itunes by clicking 'add folder to library' and do each one sepeately.
of course, this is a guide for windows as i dont know what the settings etc are on a mac, but just have a play around with that and see what you can do