The harmonica was developed in Europe in the early part of the 19th century.
Mouth-blown instruments appeared in the United States, South America and the United Kingdom at roughly the same time.
These instruments were made for playing classical music.
A brain is the most important part of human. It performs many functions such as memorize, calculate, process to control other parts of the body.
To improve brain is worth to invest. While children grow, their brains grow. Exercise makes children grow fast and strong. Brain training is like exercise.
It makes brains grow powerful. Children with powerful brains have high potential to succeed in study and work.