What is Li Bai's most famous poem? Is the song written for Yang Yuhuan the proudest song in his career?

"Qingpingdiao" says that clothes make flowers, and the spring breeze blows the threshold to show off China. If it weren't for Yushantou, I would have met Yaotai under the moon. A red dew is fragrant, and the rain is heartbroken. Excuse me, who looks like Han Palace? The poor swallow relies on new cosmetics. Famous flowers fall in love and laugh like kings. Explain that the spring breeze is infinitely hateful, and the agarwood pavilion is northward. Actually, it is not. It can be said that Li Bai's official career has always been unsatisfactory, so he will hide behind his poems. At that time, Du Li's poems were all the rage and were a must for Du Fu. As for now, later generations call him a poet.