How can I play previously purchased songs on Itunes that require password authorization?

I bought some songs a while ago on my dad's computer. Later I got my own computer, we transferred the files. Now I can't play certain songs that I bought on his computer without authorization with his email and password. However, we have tried entering the password over and over, even changed it, and still I can't play those songs. The Itunes call center and website are not giving me ANY clear answers. Please help!
Asked Aug 22, 2013

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