It’s been posted before, great vid though.
I have this video, It is awsome
It reminds me of some early disney toons like Fantasia. Next step is to get audio tracks driving facial animations automatically.
Cool stuff huh!
You can see more sample vids from the dvd here:
The instruments are proceduraly animated using a midi file.
There is a script for Blender called BlendedMidi that has the basic functionality to do this. It’s currently only for 2.27 and under, but it does work.