How can I put my songs on my ipod onto my library without buying a software?

I just bought the new ipod nano. I had the ipod mini. Now i find out that all my songs are on my old ipod. I tried to put them onto my itunes library so that I can put them on my new ipod. I don’t want to go buy a software because i was hoping there was a way to do this. Pease help!

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