How do you sync your iPod with a completely new itunes on a computer without losing all your music?

You should install iTunes in your new computer (here: Apple.com/itunes/download/">http://www.Apple.com/itunes/download/) and plug in your iPod. iTunes will then ask if you want to sync your iPod to your new computer. About trasnferring music from your iPod to your new computer, iPod and iTunes does not provide that funcionality. There are however ways to do it. You can read one of them here: http://www.ilounge.com/index.php/articles/comments/copying-music-from-ipod-to-computer