The autistic boy I work with used to calm down and go to sleep when we put music on and I am working on music with deaf children at the moment they are interested in instruments and rhythms and it interests them a lot more than signed singing. My son is dyspraxis dyslexic and has verbal dyspraxia - when he was younger he couldnt find the right words to say or remember things we overcame this by singing he would make up little songs to remember things to tell me when he got home from school and we would make up songs together to help him remember things for tests etc.