Music is another language, a way to communicate when words fail. Doris at Hold My Hand: a Social Worker's Blog has an excellent story on how she connected with a woman suffering from Alzheimer's by bringing her classical music and using sensory stimulation.
Doris has an excellent blog on working in nursing homes, and has many stories on patients who suffered from dementia. During April, she wrote a story from a woman's perspective who had dementia.
May the music of your life always play in your heart.