The song "Sad Waltz" was originally sung by Amao, composed by Li Ke, and included in the album "Amao Music Collection". The song was released on March 17th, 217. Part of the lyrics are: just walk slowly with you, let the night wind roll your sleeves and dance, just hold hands quietly, no matter whether there will be any in the future. Mao, alias Mao Jianwei, is an original Chinese musician and MVBOX columnist. His representative works include "Sad Waltz", "Have a glass of life" and "Don't get drunk tonight". In 28, the album "Sad Waltz" was released, in 29, the album "Don't Get Drunk Tonight" was released, in 21, the album "Life's Best Drink" was released, and in 211, it was put into storage on major websites and began large-scale performances all over the country.