I wanted to share this amazing story. I work in Memory Care of a retirement home. One of the residents wanders around and has the Frontal Temporal thing, she hardly ever speaks, apart from "Yeah", "Okay", "No" or random little phrases depending on her mood. One time she had friends visiting and they told me she always liked the Beatles' song 'Here Comes the Sun'. Remembering that, I played the song. I sang the "Here comes the sun" part of the chorus. She sang it back to me. I wanted to cry.