听音乐的时候，我觉得很快乐。

Tīng yīnyuè de shíhou, wǒ juéde hěn kuàilè.

When I listen to music, I feel very happy.

听音乐的时候，他的脸上总是带着快乐的笑容。

Tīng yīnyuè de shíhou, tā de liǎnshàng zǒngshì dàizhe kuàilè de xiàoróng.

When listening to music, his face always carries a happy smile.

听音乐是我每天最简单的快乐。

Tīng yīnyuè shì wǒ měitiān zuì jiǎndān de kuàilè.

Listening to music is my simplest happiness every day.