Serge Gainsbourg (born Lucien Ginsburg, the son of Russian Jewish immigrants) began his career in a drag cabaret club.  Piaf grew up in a brothel. Toulouse-Lautrec, whose parents, a Count and Countess were first cousins was, like Gainsbourg, an alcoholic with a penchant for prostitutes.  Alcohol and syphilis led to a rapid decline in physical and mental health. Toulouse- Lautrec died, aged 36.