The Royal Ballet celebrates the breadth of three of Principal Choreographer Kenneth MacMillan’s one-act ballets: Danses Concertantes (a plotless ballet for three soloists and corps), Different Drummer (the harrowing, unremittingly grim story of a simple soldier driven to madness and the murder of the only person he loves, his wife, by his inhumane treatment at the hands of experimenting army doctors), and Requiem (the portrait of a company coming to terms with the loss of a much loved director).