Pianist Frederic Chiu makes his Rockport debut with the powerful “war” sonata No. 7 of Prokofiev. The program continues with cellist Andres Diaz in Tan Dun’s Elegy: Snow in June, based on a 13th century Chinese drama, about a woman executed for crimes, despite her innocence. Even nature cried out for her innocence with a heavy snowfall in June. The concert concludes with selected movements from Messiaen’s Quartet from the End of Time, written while a prisoner in a World War II camp.