Helen:

I've been singing in nursing home for over sixty years, and have many amazing stories about sudden breathroughs to people with Dementia after long times without speaking a word. Music is usually the trigger.

Once, I was singing in a Dementia ward where it wasn't clear to me that I was getting through to anyone. There was an old woman sitting motionless in her wheel chair who hadn't shown any response to the music until I sang Lucky Old Sun. As soon as I started singing, she joined in with a firm voice, and sang the whole song with me with a smile on her face. When we were done she slipped back into the silent void.

Music can bring people back with a clear mind.