Huang An is the singer, lyricist and composer of this song, and Zhang Hongda is the arranger. You must understand the difference between composing music and arranging music. Composition is the melody of a song when singing in an oratorio, and arrangement is the arrangement of musical instruments when singing. For example, erhu, pipa and piano are used in songs. How to arrange and set the tone is called arrangement. To put it bluntly, arranger is to use what instrument to play this piece according to what melody rhythm. Songs are a combination of songs and music. You got it?