In 1940's New York, the performer who everyone wanted to see live was Florence Foster Jenkins, an enthusiastic soprano whose pitch was far from perfect. Known as 'the first lady of the sliding scale', she warbled and screeched her way through the evening to an audience who mostly fell about with laughter. But this delusional and joyously happy woman paid little attention to her critics and successfully spun from her charity recitals and extravagant balls, through to her bizarre recording sessions and an ultimate triumph at Carnegie Hall.