This is the first I'm hearing about TouchDesigner. It looks like an amazing opportunity to create custom visualizations for music videos! It is free to use for non-commercial projects, but as soon as you start making money with it you need to pony up $2,200!
I took the individual tracks from a live ambient performance I did last night in Phoenix, and remixed them in to this new track. I then created an audio-reactive patch in Touchdesigner to visualize the track, as a method for learning Touchdesigner.