I think Chad might have not allowed that type of coding on the forums. A way around it would be to find somewhere which doesn't charge for uploading a piece of music, and then linking to it in whatever post you want to use, or finding a copy of it online. When I wanted a piece of music with a promo recently, I had to link to a midi file I found (the midi file was more because I couldn't be bothered to look for the MP3, and the midi sounded just as good, lol).