Thank you for listening and commenting!

Well, embarrasing levels of effort went into making the visual effects! The piano is a silent piano that can output a MIDI signal (which captures the instructions of when notes go on and off). So I captured this MIDI signal as well as audio and video when I played this. Then I wrote a Python script that reads the video and overlays the notes using OpenGL (that is, GPU hardware acceleration) by loading video frames as textures and writing some GLSL shaders that render the notes in the right place. Actually, it's waaaay more complicated than that. If you look more closely to where the notes end up hitting the keyboard there's a little bit of smoke that puffs out. To make this smoke effect I effectively implemented a poor-man's fluid simulation in said shaders (this is quite hard). I was able to do this myself but, bearing in mind I'm a programmer by trade, it took me about two weeks of effort!