All you need is to get all music and other media files from your iPod back to your computer and iTunes. Simply use iBackup - iPhone/iTouch/iPod to Computer Transfer program to help you. I
t was designed to help copy all music, videos, photos, playlists, podcasts and more from your iPod to your computer and iTunes in the quickest and easiest way without any data loss. Then you can sync smoothly.
Just free download it to try. It works like a charm.