Q: How do transfer music from one ipod to another

The music needs to be in iTunes first before you can transfer it to another iPod.  So if the music from the one iPod is already in iTunes, simply configure the iPod to sync this music as well or however you wish. 

If the music is not in your iTunes library, see this older post from another forum member Zevoneer covering different methods available for copying content from your iPod back to your PC and into iTunes.

https://discussions.apple.com/thread/2452022?start=0&tstart=0

B-rock