Music has a positive effect on Alzheimer's patients. Alzheimer's is a neurological disorder. Dr. Oliver Sacks in Awakenings said that he considered music therapy a tool of great power. It helps many neurological disorders like Alzheimer's. He found that Alzheimer's patients who could not talk or move would sing or dance to music.
Music can organize or reorganize a cerebral function that has been damaged.
This site contains many facts about what Alzheimer's disease involves. It would provide a therapist with background knowledge. One particular section describes how Alzheimer's progresses. It affects different people in different ways. It is hard for doctors to predict what will happen next.