transferring songs from iPod touch 4 to iPod touch 6

I have an older iPod Touch 4 and have just purchased an iPod Touch 6. I own both and plan at the moment to keep both. I have a number of purchased and downloaded songs and albums. Some of the songs that I am not planning to use I would like to move to my computer. The rest of the songs and albums I want to move to the new iPod Touch. What is the best procedure?