Blowing the incense of sheng and spitting out musk under the tent means: blowing the incense under the tent and blowing the incense smell like musk.
From "Die Lianhua Mizhou Shangyuan" written by Su Shi of the Song Dynasty
Three or five nights in Qiantang, the bright moon is like frost, illuminating people like a painting. The incense of the sheng was blown under the tent, and the musk deer was spitting out, and there was not a trace of dust following the horses. People in lonely mountain towns are old! He plays drums and flute, but joins the farming and mulberry community. The fire is cold, the lamp is thin, the frost is exposed, and the dim snowy clouds hang over the field.
Translation
On the Lantern Festival night in Hangzhou City, the bright moon is like frost, illuminating people like a painting. The sheng was played under the tent, and the aroma of burning incense was like musk, and not a trace of dust followed the horses. People in the lonely city of Mizhou are getting old, and they walk along the street playing drums and flutes, but in the end they go to the Nongsang Society to worship the earth god. The lights are cold and the dew is falling, and dark and dark clouds are covering the earth, and it is going to snow.
Su Shi
Su Shi (also known as Su Dongpo, Su Xian, January 8, 1037 - August 24, 1101), also named Zizhan, also named Hezhong, and given the pseudonym Dongpo. layman. A native of Meishan, Meizhou (now part of Meishan City, Sichuan Province) in the Northern Song Dynasty, his ancestral home was Luancheng, Hebei Province. He was a famous writer, calligrapher and painter in the Northern Song Dynasty. In the second year of Jiayou's reign (1057), Su Shi became a Jinshi.
At the time of Emperor Shenzong of the Song Dynasty, he served in Fengxiang, Hangzhou, Mizhou, Xuzhou, Huzhou and other places. In the third year of Yuanfeng (1080), he was demoted to the deputy envoy of Huangzhou Tuanlian due to the "Wutai Poetry Case". After Zhezong of the Song Dynasty came to the throne, he served as a Hanlin bachelor, a bachelor of attendance, and a minister of the Ministry of Rites. He also went to Hangzhou, Yingzhou, Yangzhou, Dingzhou and other places. In his later years, he was demoted to Huizhou and Danzhou because of the new party's rule.