Select the "Store" menu and click on "Authorize Computer."
Leave the Apple ID button selected unless you sign into iTunes with an AOL account; if so, select "AOL."
Type in your user name and password and click "Authorize."
You've gone to great lengths purchasing your iTunes, downloading them onto your iPod Touch and building the perfect music library. Back that baby up onto your computer just in case something happens to your iPod Touch or you upgrade to a newer device.
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