Nothing better than a website that starts playing sound as soon as you open it!
The "click anywhere to unmute" notification was something I added some time later, after the new autoplay policy, so that people wouldn't think the website was soundless or that sound was broken.
You can see this in the page's code [1] -- line 157 and further.
I was surprised to hear the page start playing right away though. Maybe Chrome's "whitelisting" has become more permissive..? See this [2] as well.
[0] https://developers.google.com/web/updates/2017/09/autoplay-p...
[1] http://listen.hatnote.com/
[2] https://developer.mozilla.org/en-US/docs/Web/Media/Autoplay_...