(1) is also called "independence". Stand alone, stand alone. Song Sushi's poem "Feed the Year": "I also want to promote the pastoral style and advocate no one."
(2) chanting and singing alone. Tang Baorong's poem "Send a monk to the East": "Singing alone in the snow, swimming in the middle of the sky." Song Mei Yao Chen's Painting the Stone Wall in Fuyuan, Yi Yun: "After painting for twenty years, I didn't love it for many times ... Today, every Maoling person is a hero of Solo."
(3) A form of vocal music, sung by one person alone, often accompanied by musical instruments and musicians. "Biography of Nan Man in the New Tang Dynasty": "Silk and bamboo play slowly, one person sings solo, and the singer is sung by the sergeant." Zou Taofen's Message from Zong Ping 69: "One is solo, just like solo."