MoLoRa

South Africa's Yael Farber refocuses Aeschylus' Oresteia through apartheid’s lens in this overwhelming, multilingual work. For all its thunder, the piece doesn’t give way to anger or sadness, because Farber replaces the Greek chorus with the world-class Ngqoko Cultural Group, whose Xhosa songs insulate the tragedy with concatenating notes of joy.—Helen Shaw