I'm with whammy on this one.
I find it extremely annoying when site's have their own music going on, especially flash-sites that you cannot turn off !!!
I have winamp running 24/7, basically, and I have the volumebar set at 20% or so, so that I can turn it up when my favoriteparts come.
Guess what happens when I enter a site that has music going on ???
IT GETS REAL LOUD !!!
What I think you should do is to rethink this, what does the visitors want, what do they like ? Have an option that can enable music if the visitor want to, I can promise you most visitors would prefer that solution unless they are really desperate for some music!
Imagine if all the prOn-sites had 'sounds' on their sites