Dementia is a syndrome, not a disease. Dementia is a group of symptoms that affects mental cognitive tasks such as memory and reasoning. Dementia is an umbrella term that Alzheimer's disease can fall under. It can occur due to a variety of conditions, the most common of which is Alzheimer's disease
https://player.whooshkaa.com/shows/dementiaq
episode 30: Music Therapy
The emotional response that people get from listening to music, and the brain chemicals associated with pleasure that get released in the process, are distinct from the structural changes in the brain.