Music therapy as a science has been practiced in the United States for over 70 years, and there are now a large number of music therapists who work in the field of Alzheimer’s. Because music therapy has played a uniquely good role in this field, in the 1970s, the U.S. Congress passed a law that all Alzheimer’s treatment facilities must have music therapy. It is clear that music has an important role in the prevention and treatment of Alzheimer’s disease. Music has a powerful effect on stimulating memory. Each of us may have the experience that when we hear or sing a song from years ago, we naturally recall many past events of that era, and even some trivial things of life that seem to have been forgotten long ago will suddenly appear in our minds, vividly, making our hearts pound and sigh. This is why many people, especially those who are older, love old songs. In addition, when people find it difficult to remember the content of some words, if it becomes a song with a melody for it, it becomes very easy to remember and will not be forgotten for many years. For example, songs composed for ancient poems and Mao Zedong’s poems, etc. In those years, the Chinese Workers and Peasants Red Army, in response to the phenomenon that soldiers were mostly uneducated and could not remember disciplinary regulations, composed the “Three Great Disciplines and Eight Points of Attention”, which has been familiar to the soldiers ever since. Music therapists take advantage of this feature by specializing in singing or playing songs that were popular when the elderly were young and discussing with them what happened in those days and their personal experiences in order to stimulate, maintain and improve long-term memory. Also, by teaching older adults popular songs of the day, their short-term memory is stimulated so that they can maintain a better memory capacity as much as possible. Music therapists also use singing to improve the language skills of the elderly. Scientists believe that language is in the left hemisphere of the brain, while music is in the right hemisphere of the brain, so when language dysfunction occurs, it can mean that the language center in the left hemisphere is compromised. But an interesting phenomenon is that although many older people slowly become less able to speak, they are able to sing the lyrics very clearly when they sing. So the music therapist will lead them in singing together and then ask them to slowly de-emphasize the melody and just say the words. This can be very effective, and people can still maintain or even improve their language function. In addition, music therapists will use a variety of musical and dance activities to stimulate the physical functions of the elderly, increase their vitality, improve their mental and emotional state, and promote their social interactions. These play an invaluable and positive role in maintaining the physical and mental health of the elderly and preventing the occurrence and development of Alzheimer’s disease.