The Washington Post declares that twin sister pianists Christina and Michelle Naughton “have to be heard to be believed”; the Festival is honored to welcome these audience favorites for an all-Mozart program. Following the charming serenade Eine kleine Nachtmusik (“A Little Night Music”), the Naughtons perform the Concerto for Two Pianos and Orchestra, written for Mozart to play with his beloved sister Nannerl. After intermission is Mozart’s Haffner Symphony, a staggering work of intensity and invention.