By addig music to your site, you
1) Slow down the site as the music loads
2) Slow down the visitor's computer, particularly if it isn't very new
3) Annoy many people who listen to music, the television (I do
), or radio as they surf the net. For example, if I heard Charlie Had A Peigion
repeated over and over as I listened to These are the days of our lives
I would be somwhat pissed off.