She is always surrounded by an air of melancholy. This could be because she herself is melancholic, or because the lonely male hero experiences a connection with her while she is singing but cannot have her. She tends to be out of the main hero's reach perhaps because she is a dangerous Femme Fatale, because she is already involved with someone else (usually a villain), or simply because she is so aloof. This character can be very useful for highlighting a feeling of loneliness, because her sultry songs will often create a feeling of a connection between the singer and the listener, but circumstances will prevent that feeling from becoming a true connection. For that reason, this trope is a favourite of Film Noir, a genre that thrives on a feeling of melancholy and stoic loneliness.