Most people will agree "Yue Liang Dai Biao Wo De Xin" (The Moon Represents My Heart) (月亮代表我的心）, is one of the most popular Chinese Songs. This worksheet contains 3 parts, Chinese, Pinyin, English. Will easily show your students how to sing and the meaning of this song.
If you don't know or not so familiar with this song, this is very easy to sing with the singer, Teresa, on youtube with pinyin version.
Karaoke Version: https://www.youtube.com/watch?v=9R0W2X-9vWU