Here are some sad music, please listen to it:

The first is Carol's No regrets.

Second, Saxophone's "Olive Tree"

Third, pure music saxophone's "Tears of Lovers"

Fourth, Du Cong's "Edelweiss" Xiao version of pure music.

Five, saxophone's "fragile woman"

Six, Shen's "Flower Festival"

Seven, "Water Sky" pure music

Eight, trumpet "If Cloud Know"

......

The above songs are all sad background music.