AFAIK with iTunes you are not able to just move music around freely unless there has been some updates to it, I believe the music can only be moved from your PC to the iPod you cannot move it off the iPod onto the PC.
Also invest in a third party application for your PC and use that to move the music around such as Anapod's Explorer it works great, also if you have any MP3's currently those shouldn't be a problem, but anything you purchase from the iTunes store is DRM'd to hell and back.
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Spank you very much
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