how do I bring the music from my iPod Classic into my Music library on my Mac

I recently located my old iPod classic -- it still works fine - I have a lot of music on it that is not in my current music library. I would like to import the music to my Mac mini music library. Sync w finder will let me overwrite the music on the iPod but not move the iPod music to the Mac -- does anyone know how to do that?

Thanks