Down syndrome and autistic children are more holy then neviyim. Physically they are put in this temporary world to test their parents on their faith and trust in Hashem and accept the test of having a handicapped child to take care of and accept it happily versus a preferred healthy child.
Spiritually they are holier than prophets were and all love music cause their soul needs happiness to get a connection with Hashem
Next time you see one of these special children stand up for them