How do I play a song on an authorized computer that it keeps saying that the computer is not authorized.

When I go into itunes and select play song on my desktop computer I get a message that my computer is not authorized to play the song. I go through the steps to authorize the computer and it states that my computer is already authorized but it still will not play the song. Only this one song Changed by Tamar Braxton that will not play on my computer but will play on my iphone.