For this experiment I used the sound visualizer nodes form the animation nodes addon I have been asked for tutorials a lot lately and so I added a view screenshots and descriptions to explain how I achieved the effect.
as usual you can download the blend file here
please add a comment if you like this longer format posts or if you have suggestions for future posts.
the song I used for the animation is called "The Long Dawn - Part II" and can be found on soundcloud
To analyze the audio material you need a "Sound Bake" and a "Evaluate Sound" node. I also created a copy of the default cube for each bar I wanted in my animation using an "Object Instancer". The strenghts list and the object list are fed to a loop.read more ...
I made another blender animation by using the smoothing modifier to very extreme values. This time I animated them using "bake sound to F-Curve"
The sound-track was generated using hydrogen and a korg monotron
you can download the blend file here