Aesthetic pleasure hormone or neurotransmitter
μ-opioid receptors (MOR) have been demonstrated to be involved in our perception of beautiful faces (https://www.medicaldaily.com/seeing-pretty-faces-rewards-brain-perceiving-beauty-all-chemical-reaction-269074).
Here’s one study that demonstrates an uptick in dopamine upon listening to music: https://www.bbc.com/news/health-12135590