Took my money, but where's my song?

Tonight I bought Rock + Roll by EDEN on iTunes using spare cash on my account. After checking through the billing phases, I accidentally hit cancel when it said finally 'are you sure you want to purchase this item?' Thus, the song it NOWHERE in my library or purchased lists, yet my money is gone.

I would like any help on what happened and what I can do next as this is rather inconvenient - I don't want to buy it again and nor do I have the money to do so anyway.

Thanks.