It is the brain when appreciating music, not the ears.
When I suffered from insomnia, I used to listen ASMR. I thought that noise bothering us in our daily lives can be a great sound that helps us feel relaxed.
How we recognize sound depends on one’s state of mind. We can realize that how wonderful the noise is if we try to listen carefully even if it bothers us. According to psychological reasons, noise can be recognized as wonderful music, but sometimes as rasping sound. I wanted to express this duality of sound.