It's in Firefox on windows. It works in Chrome.
If I look in the console it says:
All candidate resources failed to load. Media load paused. index.html
HTTP load failed with status 403. Load of media resource https://v6p9d9t4.ssl.hwcdn.net/html/1190362/music/unrest.mp3 failed. index.html
All candidate resources failed to load. Media load paused.