Sorry, can't help you nor do I know of any way to do that between webpages.

However, I can tell you that it would cause me to leave that site in a huge hurry. There is nothing more annoying than background music on a website.

I still use iFrames but only to forward a domain to another and to keep the address static. The browsers all still recognize them. I thought of that but if I am not mistaking the address in the address bar would stay constant unless you got into some serious framing.

I had a fully framed website and it was a lot of work because each frame is kind of like a distinct webpage. Might be to much work to be worth the effort.