When you increase demand you increase the value of a product, when you increase supply you decrease the value of a product. Basic economics. Let's take this concept and apply it to money. If you print money you increase the money supply. When you increase the money supply you decrease the value of money.
Thus the action of counterfeiting is actually theft. By printing money you lower the value of other peoples' money and thus you are stealing value from other people. That's why counterfeiting is bad. Written laws on forgery and fraud don't cause this phenomenon they are a consequence of it.
The same academic principle works for piracy. Get it? You copy a product you devalue the product by increasing supply. These are principles of Basic economics and Intrinsic law that permeates the fabric of reality. In essence: When you pirate a product you are stealing it, there is no way around it.
Why is it not ok to pirate money but it's totally ok to pirate music? I'll tell you why. The issue touches the roots of humanity's morally ambiguous nature: When you pirate money, you harm everyone who owns money and face the ire of the entire population.
When you pirate music you harm only the creator of the music and you probably got a lot of friends who do the same thing. Significantly easier to do from an ethical standpoint. But how do you face yourself? What does a typical weak, cowardly human tell himself when he commits a crime? A typical human will create an overly-complicated and sophisticated logical delusion in order to justify the action to himself. Stupid logic like "downloading an mp3 makes me more likely to buy the track" are typical examples. In fact, you can likely witness a version of this overly-complicated logic in your response to this post.
Is that enough discourse for you? Yours is the lazy rebuttable without foundation in reality.