Xintianyou (xin(4)tian(1)you(2); 信天游 ) is a folk music style from Shaanxi province. The name literally means rambling in the sky. The style was originally sung and developed by porters carrying goods to far off regions. One of the most famous songs in this style is lan(2) hua(1)hua(1) (藍花花.)
References
Xintianyou Wikipedia(Text) CC BY-SA