I would like to save the music from my iPod to my computer, so that I can erase the music I have on my iPod and add new music….
You need a good software to manage your ipod! What I am using is freeware Syncios. With this freeware, you can batch manage your music, videos, ebooks, etc.
i used PodTrans Pro from iMobie to copy all my Itouch music to my PC.
can be found at http://www.mobie.com
I downloaded itunes to my PC running Windows7, when I was asked if I wanted to "sync" I said yes, and all my itunes showed up. I run feeware to convert M4a files to MP3 if needed. Unfortunately there is not yet any itunes for Windows8
Another application that worked fine for me: DeTune (http://www.headlightsoft.com/detune/).
In case you've got a "clickwheel" iPod: All music files are "on disk", but in a hidden folder and renamend... Mount the iPod as external drive, then copy the files from the hidden music folder -- and have fun retagging them :-/
That's why I used DeTune...
You could also take a look at Copytrans - http://www.copytrans.net/
You can give sharepod a try - http://www.getsharepod.com/
perhaps i-Funbox can help