How to write happy music in traditional Chinese characters?

The traditional Chinese characters of "Happy";

"Happy" means to feel happy or satisfied: smile. Happy birthday ~.

Make sentences:

1. On a bright spring day, we study happily.

The whole family raised their glasses to wish grandpa a happy birthday, health and longevity.

The happiest people are those who are too busy to notice whether they are happy or not.

Extended data

Synonyms of "happiness": joy and happiness.

I. Joy

Happiness (mostly collective): the songs of ~ in the square come and go.

Quote: Act III of Cao Yu's Wang Zhaojun: "I come for the joy of two people."

Second, happiness [kā i x and n]

1. Happy and comfortable: Everyone is together, talking and laughing, very ~.

2. Others in Doby, Doby is happy: don't take him.

Quote explanation: The first act of Sunrise by Cao Yu: "Hei San: (with a smile) Grandpa Pan, don't be happy with us."