transfer songs from ipod to mac

I have an iMac 11,2 running OS X 10.6.8. i'm using iTunes 11.0.. I have songs on an 8GB 6gen iPod Nano, given to me by my girlfriends son. Songs were attached to a PC thats not in service anymore. How can I transfer the songs to the iMac and put fresh tunes on the iPod?

Thanks

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