The Ningbo Children's Choir tours several famous universities and colleges during their stay in Princeton. [Photo/zj.zjol.com] 

"It is a good opportunity for the children to broaden their horizons by exchanging with some excellent music groups overseas," said Zheng Si, founder of the choir.

Ningbo has seen a boom in its choir development in recent years, with many large chorus competitions held and many local choirs established in the city.