My ds 11 sings all the time. He especially sings while doing homework. In 5th grade during our PT Conference all the teachers made comments about the noises he made while working in class. I told them he sings and especially when he needs to stay on task. Some gave me a funny look and some said it is a sign of a happy soul. He is better this year but at home he still sings up a storm. The day he doesn't sing I will wonder whats wrong.