People who've had strokes or traumatic brain injuries often live with aphasia: difficulty using language, both written and spoken. But music mostly originates in the undamaged hemisphere of the brain.

APHASIA CHOIR OF VERMONT: (Singing) Whenever I want you, all I have to do is dream. HEILMAN: What are the 18 sort of common ways that people react in moments with people who are struggling to speak?

APHASIA CHOIR OF VERMONT: (Singing) Whenever I want you, all I have to do is dream. HEILMAN: What are the 18 sort of common ways that people react in moments with people who are struggling to speak?