Whenever a sound that lasts longer than three seconds is launched automatically, you must provide a way to stop the sound at the top of the page.
Warning
You are strongly recommended not to include sounds that are triggered automatically. Some users will be disconcerted by a sound that is launched without any action on their part, and it may be difficult to find the source of the sound when several tabs are open. Other users will simply be blocked—users of voice synthesisers will no longer be able to continue navigating, for example.