Cant add audio to phonegap

I am trying to add audio to my app Using a USB and Intel XDK it works fine but when I try it on my phone it doesn't work

I have tried

<audio autoplay loop>
<source src="/android_asset/www/background.mp3" type="audio/mp3" />
</audio>

,

<embed src="/android_asset/www/background.mp3" autostart="true" width="0" height="0">
</embed>

and

myMedia = new Media("/android_asset/www/background.mp3");
myMedia.play();

I tried them with and without '/android_asset/www/'.I have the media plugin installed for Phonegap too. Also, the third one stops all code after it from running.

Thanks in advance