Gareth Malone becomes the latest celebrity to dig into his family's past in the popular genealogy show. The choirmaster knows he got the singing bug from his parents, who met while acting together in musicals, and now he wants to know how far back this love of the stage goes. He starts out by looking into his mother's side of the family and strikes gold immediately as his investigations take him to the West End. Along the way, he uncovers tales of the heyday of music hall, a theatre impresario in Dublin and even a performance for King George V.