voxelMeter is an audio visualizer that uses the Fast Fourier Transform to visualize the frequency spectrum using cubes! It was built using cross platform open source software, and will run on pc, mac, and linux... isn't that grand?
Find more info at ccrma.stanford.edu/~mborins/256a/voxelMeter/
Download the source on github at github.com/TheAlphaNerd/voxelMeter
The music you are hearing is called "Mesaging the Mediums" you can download it here soundcloud.com/thealphanerd/messaging-the-mediums