The web platform is a wonderful playground of artistic and technical expression. The artists of the web often release amazing creations combining 3D elements and music in the most compact form. But you don't have to be a seasoned developer to express yourself and build your own animations. With the right approach, anyone can build Audio-Visual demos! This talk will go through creative coding, the demoscene, and a range of optimization tricks. Then we will work on a little Audio-Visual demo together.