Click the screen to cycle through different styles. Press [S] to toggle some visualisation settings. If you are having audio synchronisation issues, try pressing the green flag again, sometimes the first play has a little bit of lag. See inside for how it works and how to import your own songs. The method is very similar to what @colorgram used in "Music Visualizer X".
SO many Thanks to @awesome-llama, Best heard with head-phones.
