I’m a fan of Glenn Marshall’s music videos and his latest video shows why. 

It’s a generative video exploration of Radiohead’s Bodysnatchers, from In Rainbows. 

Here’s how Marshall explains how the audio is interacting with the generative video:

1. Bass guitar – makes the red shading on the red zeno pulsate.
2. Lead guitar – affects intensity of inner glows of both zenos.
3. Treble – affects size of sprites.
4. Vocal – additional affector to red sprite size, affects speed and directions of all sprites, affects size of stars in background.
5. X Factor – this is the name I gave to the overall amplitude – an ‘excitement’ factor. This controls the camera Z depth (near/far) – loudness brings us closer in, quieter breaks bring us out again. This was important to get that sense of a non-static journey and spatial interest that married with the music. The X Factor also increases the speed of the zenos growing, and the intensity of the blue cloud.

Audio analysis is an art in itself, finding whats interesting, isolating cleanly from everything else, and hooking it up with the visuals somehow.  You can see there are endless variables and permutations to play with, which makes it a fascinating form of audio visual art, especially when mixed in with generative animation.