hi Q
if i understand you right, you want the music to play on the pages you have in the group
well, you cannot add the music code to msn custom pages (pages you make with msn tools for managers)
the only way you can make the page to play the music is to do it in notepad and store it in documents, just like you did with this one
(and that's how they did it at the tips and tricks site too)
so here's what i suggest:
to add a clickable link to the same page with the music and add the explanation that the link will only work for members of the Corral when they are logged in to their account