Kristen Lee Sergeant is a jazz vocalist who always seems to be singing about fire. Even her website greets the visitor with a curl of animated smoke, and her album, which contains a brilliant cover of ‘Smoke Gets In Your Eyes’, is entitled, ‘Smolder’. Her latest self-penned single, ‘Balm/Burn’, also uses the metaphor of the flame – as well as the salve to heal it – to take a closer look at a rocky romantic relationship.