Add music to website background - repost

I have purchased this Wordpress theme [login to view URL] As you can see on the home page there is music on the background. When you click on internal page the music stops what I want is to modify code and make the site play music in the entire site without stoping at all. the only way to stop is by pressing the button "music" on the bottom right, which will be visible during all the site navigation (now it disappears if you click to an internal page). Here is a live example of what I want : [login to view URL] Music never stops. So I need someone to make the background music works globally and the button always visible until you press it and music stops. As I understand it has to turn the page loading instead of refresh to ajax. The site layout I have is compatible with ajax loading so it will not be difficult for a coder. Although is Wordpress theme NO wordpress experienced is required, everything you need to change is HTML/Ajax. Selected developer will have ftp access to files. estimation: 4 hours work x 5$ = 20$