Usually what you want to do is use a midi as your sound file so that everyone can hear it since a big file would make it unbearable to wait to hear it. IE 56k users or if your server is slow. People like doing things with their webpages but don't think this is cool because a lot of times it is not. It turns out to be a hassle to wait for your page to load when you have a lot of extra stuff going on. To recap unless your site is based on music I would advise against this. If you really want to use music I recommend a midi that is small.