I've come accross this website a few times but only now clicked on the hamburger menu and then on "how to use" to learn that learned that you had to zoom in and

I've come accross this website a few times but only now clicked on the hamburger menu and then on "how to use" to learn that learned that you had to zoom in and click on a "button" (some kind of polygon approximating a circle?) to listen to the music. I think I tried clicking on the titles before and concluded that it didn't work.