1. Every step there is a 60% chance a random branch dies. But one branch always remains.
2. Every step there is a 50% chance that a random branch sprouts a new branch.
3. Branches move away from their nearest neighbour and don't like to be close to the edges.

https://mishathings.org/random_things/plant.html

Some other music here: https://mishathings.org/music_things/new_album_electro/new_album_electro.html