How to add music to a story

I am trying to add a background music to my story with this inserted into the top of the start of the twine story.
<audio autoplay loop>
<source src="music/hearthstone.mp3" type="audio/aac>
</audio>
The music file is a subfolder for which the HTML doc is stored, the specifications are all correct, i have tried to get it to work with the torch browser and firefox. Am i missing something?