can't play 1 song

For whatever reason, I can't play a song from my iTunes. Every single time that I try to play the song, I have to "authorize" the computer. It "re-authorizes" the computer even though it says always that it's been authorized. I have over 260 songs in my Library, for whatever reason, it's the only song that keeps doing this. Also, I downloaded a second song from that same album and there are no issues playing that particular song or any of the others......