What do you mean by chorus?

Harmony writing: Generally speaking, what the arranger does is to write out the chord direction of a song.

Harmony (backup singer) design/recording: The voice you hear in the accompaniment is the backup singer of the design.

Chorus: (also called chorus producer) A subdivision post, which is mainly responsible for guiding singers to sing. It requires a high degree of professionalism, and it is necessary to be able to control the mood of music styles and paragraphs, and to cooperate with the sound engineer to complete the recording work of the singer.