Marking the 80th birthday of one of Broadway's great innovators, this first ever all-Sondheim Prom draws together leading figures of the opera and theatre worlds, plus some further special guests.Bryn Terfel – a magnetic Sweeney Todd, as he proved at the Royal Festival Hall in 2007 – leads a starry cast, joined by aspiring young performers supported by the BBC Performing Arts Fund. On the bill are excerpts from the horror-opera Sweeney Todd, the Ingmar Bergman-inspired A Little Night Music and the fairy-tale compendium of Into the Woods, as well as excerpts from Company, Pacific Overtures and Sunday in the Park with George.