User blog comment:Emmaelise401/Template Idea: Youtube Music Player/@comment-4189499-20140226214529

Auto-playing music is usually considered a bad thing, and something which is likely to get someone to want to escape out of that page immediately! If you want music on your page, make the option to start it, not to stop it. If I'm listening to music while editing, I don't want to suddenly have something different start playing when I open a page, and people are more likely to backspace out of the page than go searching for the stop button. I've seen several people ask about this in the past on Community Central, and the response has always been that it's best not to do it because it's considered rude (although they usually give the code anyway, just with a strong warning against using it).