It is due to certain settings in the browser profile that I use for everyday surfing. Without giving too much information, let's just say that although some things are blocked, popular music and video streaming web-sites still work, so I guess this one should also work. It works in a clean profile with default settings in the same browser.
There are some errors like this:
Loading failed for the <script> with source “https://platform.twitter.com/widgets.js”. generative.fm:1:1
Loading failed for the <script> with source “https://www.googletagmanager.com/gtag/js?id=UA-134692042-1”. generative.fm:9:1
TypeError: this.context.createConstantSource is not a functionmain.7acf3eaa3b54511db064.js:7:5340