How am I not authorized to play a song I just purchased? Help!?

I just bought an album off iTunes (Mortal City by Dar Williams). All of the songs work fine except for "The Christians and the Pagans." When I try to play it it tells me that my computer isn't authorized to play songs from the account (even though I just downloaded it from the same account). I try to authorize my computer like it prompts me to do, and it tells me it is already authorized. I tried deauthorizing and reauthorizing my computer and it still doesn't work. I even deleted the song and redownloaded it from the iTunes store and it still doesn't work. Help please?