"Purchased" song not in iTunes library

I purchased a pre-album release single a month or so ago and was able to play it without issue. The album came out today and I was able to download the rest of the album with out issue, however, now the pre-release single is not showing up in my iTunes library. When i go to iTune and look for the album, the pre-release song has "purchased" next to it while the rest of the songs have "Play" next to them. When i look at my purchased history in iTunes, the pre-release single does not show up in there but the rest of the album does.