Where does the phrase "Drunk with a piano as a pillow" come from?

Sikong Tu's "Twenty-Four Poems - Elegance" mentions:

Buy spring with jade pots, and enjoy the rain in thatched huts. Sitting in the middle is a good scholar, with bamboos on the left and right. The white clouds are beginning to clear, and the birds are chasing each other.

Mianqin is green and shaded, with a waterfall on top. The fallen flowers are speechless, and the people are as pale as chrysanthemums. The age of the book means it can be read.

There is a saying about sleeping on the piano, which is the predecessor of "drunk and sleeping on the piano".

Fanjia Huzhuang has a purple sand bulging belly pot from the Republic of China period, commonly known as a warm wine pot. There is a cup in this pot, which can hold wine; in the purple clay pot with a bulging belly, put hot water to warm the wine. The inside of the lid of this pot is inscribed "Pangen", and the bottom of the pot is stamped with "Taoist Bing Xin" in seal script. "Bingxin Taoist" is the name of Cheng Shouzhen, a famous purple sand artist in the Republic of China. Pangen is his son, who is also good at making pots. He learned from his father. In order to meet the requirements of customers, he always puts his father's mark on the pots he makes. Therefore, this name The pot should be the work of Cheng Pangen. The belly of this pot is engraved with landscapes on one side and a cursive inscription on the other side: "Drunken with wine and harp as a pillow, poems and crazy stones as writing notes, rocks as thick as twenty years' worth of writing."

The first couplet is "Drunken with the piano as a pillow". Since it is a wine warmer, the wine is cut. After being drunk, he fell into a deep sleep. He was probably playing the harp just now, but he was using the harp as a pillow. It writes about drunkenness without losing elegance. The second line is "Poetry and Stone Writing Notes". Drinking wine helped to stimulate poetry, and he recited poems like crazy. For a while, he had no paper and pen, so he used stones as writing paper. The madness is adorable, and the madness is adorable.