Gay: The Beggar's Opera / Christie, Burt, Klein [Blu-ray] Les Arts Florissants (early music ensemble) William Christie Music : John Gay Libretto : Johann Christoph Pepusch Mr. Peachum : Robert Burt Mrs. Peachum / Diana Trapes : Beverley Klein Polly Peachum : Kate Batter Macheath : Benjamin Purkiss Lockit : Kraig Thornber Lucy Lockit : Olivia Brereton Jenny Diver : Emma Kate Nelson Filch / Manuel..