A:You can use an ipod to computer transfer program copy the songs from ipod to iTunes first then sync to a another.I personally use Cucusoft iPhone/iTouch/iPod to Computer Transfer.It helps me to transfer my songs/videos/photos from ipod to my computer iTunes directly and safely.It works well for me,you can give it a try. Free download it at: http://dvd-video-soft.com/ipodconverter/ipod-itouch-iphone-transfer.html
It even has step-by-step guide on the whole process.
Hope it helps.