Words, Mozart and Gregorian chant.
All are part of a new therapy designed to help children with developmental delays.
Tomatis Therapy is an auditory training program that mixes words with music and uses repetition to improve skills. 
The creator's daughter has brain damage and he began using the approach to improve her cognitive development.  Children are said to see a decrease in frustration and an increase in focus while using the program.  
A two year old with Cerebral Palsy is one of the participants and is said to be making progress by combining Tomatis Therapy with motion and exercise.
At this point, only a handful of therapists are using this listening program.