Add or remove a page background sound
When you add a background sound to a page, the sound will play when the page loads. You can specify how many times the sound will play or whether it will loop continuously.
If you include sound in your page, consider giving the user an easy way to turn the sound off (for example, with a "No sound" or "mute" icon button).
In Design view, right-click the page, and then click Page Properties.
In the Page Properties dialog box, on the General tab, under Background sound, locate and click the sound file you want, and then click Open.
Do one of the following:
To play the sound continuously, select the Forever check box.
To play the sound a fixed number of times, clear the Forever check box, and then select or type the number of times you want the sound to play in the Loop box.
Adding a sound adds a <bgsound> tag to the header of your page. This feature is not supported by Netscape or Mozilla Firefox browsers.