IPhone 5, iTunes and Mac software?

Ok I just got my iPhone 5 today and I'd like to transfer all the music from my iPod to the iPhone… But my dad hasn't updated our mac for a long time, and I need a certain iTunes to make iTunes recognize my phone, but for that I need to update a new mac os x and I can't find the one that I need anywhere! Is there some way anybody can help or new solutions so i can get all my music from my old iPod to my iPhone?

The latest version of iTunes requires:

Mac computer with an Intel Core processor
OS X version 10.6.8 or later

You can get Snow Leopard (OS X 10.6) from the Apple Store:
http://store.apple.com/...w-leopard#

If you have an older mac with a G4 or G5 processor it will not be able to run OS X above 10.5.8 and can't be updated further.

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