I came across two interactive website that is video based. The first project is LSD by Spencer Sheridan, that is a keyboard interactive music video for the band Busy Living. Viewers of the music video is able to add and overlay shapes, colors and videos onto the music video to create an unique visual experience every time the music video is played (check out the music video here).
This experiment lets you play your keyboard like an instrument to overlay colors and images to create your own music video, and I am interested in creating an unique experience to a short video.
The second example provides mouse interaction of the user on the page to generate music. GeoSound is a webpage By Yanlin Ma that generates sound through geometric object collision. It provides an interesting way to allow people to make sound and contribute to the sound they are experiencing.