Students ask Ren for the right fingerings during breaks in class.[Photo provided to China Daily]

After the competition, Ren told Chen to bring together all the blind people who wanted to learn the accordion in Beijing, and promised that he would teach them for free.

The task was not easy. But Ren first converted the five-line spectrum staves into numbered music notations, and also devised the "touch teaching method".

He holds the blind students' hands to teach them, helping them to touch the keyboard and the bellows. And if the blind students do not grasp the pace, he presses his feet on theirs to help them keep time.

During the classes Ren's fingers jump countless times between the black and white keys, but despite the hard work he continues undaunted.

Many of the blind students were not born blind and excelled in various fields. But blindness often makes them extremely depressed.