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Joe, a nursing home resident, broke into song during a personalized music session. His story and others are documented in the film Alive Inside.

Joe, a nursing home resident, broke into song during a personalized music session. His story and others are documented in the film Alive Inside.

Henry, an elderly Alzheimer's patient in an American nursing home, recently became a viral star. In a short video that has been viewed millions of times online, he starts out slumped over and unresponsive but undergoes a remarkable transformation as he listens to music on a pair of headphones.

The clip is part of a documentary called Alive Inside, which follows social worker Dan Cohen as he creates personalized iPod playlists for people in elder care facilities, hoping to reconnect them with the music they love. Cohen tells NPR's Melissa Block that the video of Henry is a great example of the link between music and memory.

"He is able to actually answer questions and speak about his youth, and this is sort of the magic of music that's familiar for those with dementia," Cohen says. "Even though Alzheimer's and various forms of dementia will ravage many parts of the brain, long-term memory of music from when one was young remains very often. So if you tap that, you really get that kind of awakening response. It's pretty exciting to see."

Cohen says his goal is to make access to personalized music the standard of care at nursing facilities. An early concern, he says, was that headphones might isolate the patients even further. But when he first implemented the project on a large scale in 2008, putting 200 iPods in four facilities around New York, he got the opposite result: a flood of stories from the staff about increased socialization.

"People wanted to share their music with others: 'Here, you've gotta listen to this,' or 'What was the name of that song?' " Cohen says. "The music is great, but to me, perhaps the even bigger win is people having better and more relationships with those around them."

Get the playlist right. Find out the person's tastes and create a varied mix: no more than five to seven songs per artist. Have them weed out tracks that are so-so, so you end up with 100 or 200 songs that all resonate.

Keep it simple. Make sure the elder knows how to use the player, or that someone nearby can help. Use over-ear headphones rather than earbuds, which can fall out.

More here:
For Elders With Dementia, Music Sparks Great Awakenings