葉蒨文
Tsui and Woo disagreed on the musical aspects of the film. For the opening scene, Woo wanted the singer to perform a jazz song and have the killer playing a saxophone. Tsui rejected this idea as he felt that the Hong Kong audiences did not understand or like jazz. Woo stated that he "had to change it to a Chinese song, the kind of song they always use in Hong Kong movies." Actress Sally Yeh who performed the Cantopop songs did not feel they were appropriate for the film. The songs were requested by the studio and written specifically for "The Killer".