I got new notebook for xmas intalled itune app but not able to listen to my music I have previously purchased until I authorize my computer. How do I do that?

If the computer's running Mac OS X, move the cursor to the very top of the computer's screen, click on Store, and choose Authorize this Computer.

If the computer's running Windows, press the Alt and S keys and choose Authorize this Computer, or click here, follow the instructions, click on Store in the menu bar, and choose Authorize this Computer.

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