Plot: Returning to the Proms for the first time since 1988, cellist Lynn Harrell celebrates the 95th-birthday year of Henri Dutilleux with a performance of one of his best-loved works, nocturnal, mysterious and beautifully coloured. Debussy's languorous reverie fired up a stylistic revolution and gained notoriety when Nijinsky choreographed it for Diaghilev's Ballets Russes