A few naughty children sitting on the back of a cow humming country tunes, which two ancient poems remind people of?

The shepherd boy rode a cow and sang loudly, trying to catch the cicada, and suddenly stood there silent.

This is Yuan Mei, a poet in Qing Dynasty. He occasionally saw a shepherd boy riding leisurely on the back of an ox, singing loudly in his mouth, as if he were walking through the Woods. Suddenly, he heard the sound of cicada, and his singing stopped suddenly, for fear of disturbing cicada and flying away. The picture that cicada tried to capture aroused the poet's emotion, and thus he wrote this famous poem that he saw.