According to the poem "But we drink to our guests coming home from the camp and play the savage pipa, guitar and harp for him", when did erhu spread?

As can be seen from this poem, erhu was popular in the Tang Dynasty.

The whole poem is as follows

: A song of snow sends Tian Shuji Wu home.

Cen Can in Tang Dynasty

The north wind swept across the earth and messed up Pennisetum, and the weather in August will be covered with heavy snow.

Suddenly, like a night wind blowing, like a pear tree in bloom.

Snowflakes fell into the curtains and wet them. The fur was not warm and the gold cup was too thin.

The general used cold hands to protect his hands. The armored steel was too cold to wear.

(Difficult to do: still writing)

The desert freezes over/kloc-0.000 feet, with a crack, and the sky is full of darkness and melancholy.

In the manager's account, this wine is a farewell party, and the Huqin Pipa flute ensemble adds luster to this entertainment.

In the evening, in front of the headquarters gate, heavy snow fell, the red flag froze, and the wind could not drag.

Luntai East Gate, welcome to the capital. Go, the mountain road is covered with snow.

Then he disappeared around the corner, leaving only hoofprint.