There was a thread not too long ago where someone asked about continuous background music that is not broken by the viewer surfing from page to page within the site or a section of the site. I do not recall a solution being provided. In playing around searching for a solution- I stumbled upon the following. Please excuse me if you already know this or if it has been proposed.
Here is an example of how it works;
and here is it's explanation;
To all- have a great week!