Currently Being ModeratedAug 11, 2013 11:54 AM (in response to Kendra13)
On your MBP, in iTunes pull down the Store menu and click "authorize."
Also, your personal data, including music, will not just appear on your new computer. You must put it there. The most effiecient way to do that is is to transfer it from the old computer. See these Apple KB articles for help: