performance remained the 1937 film, Street Angel. This contained two theme songs: "Four Seasons Song" () and "The Wandering Songstress", which enjoyed long-lasting popularity. Other well-known songs by Zhou Xuan include "When Will You Return?", "Shanghai Nights" (title song from the film of the same name), "Yellow Leaves Dancing in the Autumn Wind" (), "Eternal Smile" (), "Hundred Flower Song" (), "Advice" (), "Where Can the Soul Mate be Found" (), and "Picking Betel Nuts" (). Death In 1957 she died in Shanghai in a mental asylum at the age of 37. A possible cause of death may be encephalitis following a nervous breakdown. Zhou's diary concluded that she suffered from cerebritis. Zhou Xuan was survived by two sons, Zhou Min and Zhou Wei, born of different fathers. Zhou Min was widely believed to be the son of the businessman Zhu Huaide, who left for Shanghai in 1950 after Zhou Xuan entrusted him with her savings and never returned; Zhou Min was born in that same year. According to her elder son Zhou Min's biography, her younger son, Zhou Wei, was the son of the art designer Tang Di (), while the biological father of Zhou Min himself was not revealed. Zhou Wei currently lives in Toronto performing at times in the TTC subways and participating in various musical projects, including teaching. He is a flautist. He has two daughters, both musicians. The elder of the two, Zhou Xiaoxuan, is a classical pianist trained at Concordia University and now living in Beijing. The youngest, Amanda Zhou, is taking a similar path as an actress and has already worked on a few shows and films. Cultural legacy To this day, Zhou Xuan's songs still remain a staple in many Golden Oldies collections in Mandarin popular music. There have been two biographies written by Zhou Xuan's surviving family members. The book My Mother Zhou Xuan () was written by Zhou Wei and his wife Chang Jing (); while a later book, Zhou Xuan Diary (), was written by Zhou Min. Television An adaptation of the life of Zhou Xuan was produced in TVB's Song Bird (1989), starring Adia Chan as Zhou Xuan and Leon Lai as her lover. In this series, Xuan's songs were re-written in Cantonese and sung by Chan. She sang duets with Lai in the program while under Crown Records (). Deric Wan replaced Lai's vocals on the soundtrack