I'd promised to blog about how I made it so here goes. I'll keep it quick because there's not much to it really. There's a plug-in for After Effects called Trapcode Form and it makes particles in 3D space which can be customised to these cloud-like objects.
These can respond to custom audio input (in this case my carefully crafted masterpiece). Different frequencies can be selected to affect different particle parameters in a various ways. This of course cuts out the need to manually keyframe animation events in time to the audio track which would take forever.
A few camera movements and a bit of colour correction and there you have it – one music video. All made in an afternoon. I'd like to thank my parents, all the guys at Trapcode, Adobe, Apple…