Hum when you are in a bad mood.

Colleagues are humming songs while working.

"In a good mood," I told her.

"Wrong, just the opposite," SASA replied. "I usually sing when I am in a bad mood."

I remember being like her. Whenever I am bored and have nowhere to tell, I will hum a song.

One song after another makes me have no extra time and energy to think about those unpleasant things.

When you sing, especially when you are absorbed in singing, you seem to forget other things, immerse yourself in the wonderful lyrics, imagine the story hidden behind the lyrics, and sing along with the song.