What is the story of He Zhangzhi's "Singing Willow"?

In the third year of Tang Tianbao, He went home by boat, passing by the old house on the riverside outside the south gate. At this time, it happened to be early spring in February. When he saw the scene of budding willow buds and spring, he couldn't help but write this song "Singing Willow" directly.

He, a native of Yongxing, Yuezhou, was a famous poet and calligrapher in the Tang Dynasty. When he was a teenager, he was famous for his poems. Later, he was admitted to Shengyuan in the Tang and Five Dynasties, and became the No.1 scholar in Hanyi. Later, he won four doctors in Guo Zi and was transferred to Dr. Taichang. After he entered the academy, he was mainly responsible for the editing and editing of the Six Classics and essays, and later gradually became the right bastard, assistant minister and assistant minister of the Ministry of Industry of the Prince. Because he is broad-minded and good at drinking, he has made many friends and has a good reputation for speaking freely.