iPod Help!

So my mom has a 2nd Gen iPod nano. Our last computer was fried and we lost all hard drive info. Now my mom want to sync all songs that are on her iPod with our new computer. Each time we have tried this iTunes wants to erase the iPod and place the iTunes music back on it. The only problem is that she has music that was transferred from CD's to the iPod. Over the past few years some CD's have been lost and she does not want to loose that music.

How do I sync the iPod with iTunes and not...

iPod Help!