I'd venture to say that most of us have at least one $1 MP3 credit on our accounts, from past purchases, especially in the last month. Since Amazon's checkout doesn't explain which promotions actually applied to your purchase, it's probably safe to say that you had a promo code on your account, already, rendering the purchase free.
You can't see the MP3 credits on your account, the way you can see gift card credits. You have to actually go to an MP3 item and click on the link below the 'buy this with one-click' button, which says something about buying the MP3 with credits. Then, you'll see all your promo codes (no expiration dates, though, which is another issue).
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