Hello, I want to make backgroundmusic for my webproject. The problem is when I run the Markup Validation is gives me errors, made 2 versions and both failed, could someone guide me ?

This one does not work in Firefox for some reason.
HTML Code:
<audio controls>
<source src="music/runrunrun.mp3" type="audio/mp3"/>

HTML Code:
<embed src="music/graveyard.mp3" id="music" width="200" height="40"></embed>