Calling all detectives! Come and help the BBC Concert Orchestra solve the mysteries in their musical family tree. Who was the celebrity musician who captivated the court of Marie Antoinette to the infuriation of a struggling Mozart? And why have we never heard of him? What is the most played piece of classical music ever and how many composers have been inspired by it? Who was the mostly self-taught, highly opinionated military man considered the god-father of all 20th century Russian music? And what secret does our conductor Anna-Maria hide?