What Is A Good Song For A Video To Be Shown At An Alzheimer’s Benefit?

My friend lost her mother two years ago from Alzheimer’s disease. Since then she has organized a foundation to bring about awareness and raise funds for the Alzheimer’s Association. The foundation is hosting an event in September and I would like to produce a video with pictures of my friends mother, honoring her. What would be a good soundtrack to use for this montage?

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