Can i transfer all my songs to itunes?

I have an ipod, iphone, and ipad with different music on it. Can i upload all the music to itunes without it erasing anything? And be able to get songs from my ipod to my iphone and such? Sorry itunes is really confusing

ITunes will not allow you to transfer music from your iDevice to your computer - only the other way around.

But you can use DiskAid to transfer stuff from your iDevice to your computer
http://www.digidna.net

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