Clearly I'm missing something here when trying to buy a song on iTunes?

I have to be clearly missing something here… A a week ago I bought an individual song on iTunes (500 Miles - The Proclaimers), but now I don't see the option to buy when click on the price of other songs. Am I missing a step or something I forgot? I'm logged into my account and everything from the app on my PC laptops… Any thoughts? I haven't used iTunes in a long while and I just recently updated my iPod touch and I want to update my library by deleting some stuff which is easy, but I also don't want to add songs. Buy option not showing? It picks the "software" section on here to post that question, not sure if that's the right one but we shall see. ANY help is greatly appreciated thanks! Clearly I m missing something here when trying to buy a song on iTunes

Just click on the $1.29 to purchase.