Play sound while fade scene to black

I need to help a student figure out how to make his scene with a band playing music fade to black while the music still plays for 5-10 sec. I can make it fade, but can't get the timing right. I'm sure it is easy, but I've tried if/else and while statements and still can't get it. The scene has objects who are doing things in infinite loops. Not looking for elegant- just workable. It throws an error on opening, but runs anyway. File is attached.

Any help would be appreciated. Thanks

[jediaction]

Well, it has errors finding parts of the body. I don't have time right now, but go over everymethod that searches for the specific body part...