By "chaotic", we are NOT talking about a song that is too noisy and helter-skelter to bear, but one that starts from nothing and ends there! According to the butterfly effect (an example of Chaos Theory):
The flap of a butterfly’s wings in Brazil can set off a tornado in Texas!
So in this scenario we can define a chaotic song as the one that starts quietly and peacefully but ends in complete confusion. A good example we could find is:
Try it and post the one that follows a similar path! Maybe we can make a good chaotic playlist of out of it.
Looking forward! It's a great album by a great band from Wales by the way.