Yes, you may think it is nice, but what about your visitors? Me, personally, I often visit websites listening to music, and the one thing I hate is when I go to a site with background music, which is NEVER of good quality and way more often then not, I', not all that fond of it. Though, if you must have music available, why not embed a player so that users can choose to play, stop, pause, fwd, rew it? That at least gives visitors a choice, thought the loading speed of the page will still take forever.
EDIT: Sorry, the code for that would simply be: