About 530 million years ago the so-called "Cambrian Explosion" occurred, marking a sudden surge lifeform population and biological diversity. Fossil records show an almost immediate leap forward in the complexity of countless species, and the overall makeup of life began to take shape as it exists today (in terms of animals and plant life). While geologically an "explosion," this process actually took millions of years and hence today's music is more of a gradual crescendo of coalescing and evolving individuals.
Maybe not quite Cambrian... but close enough. It's no single celled/simple multi-celled organism.