Sound on 2 different scene

I have a big problem, I have a sound (music,mp3) at the starting of my web site. It is loaded dynamicly with actionscript. I want that sound continue on the scene after and loop also. Usualy I would set that sound (on timeline without action script) on event with loop and that’s it. But this time I have buttons make it play and stop.

For sure I can set it on event too but the button on scene 2 won’t interact with the sound on scene 1.

So how can do it work?