“In truth, “Oresteia” is less an opera than a hybrid oratorio and ballet. The choruses convey much of the drama in a highly stylized, changeable language that at first has the rhythmic and melodic character of church chant and later takes on a freer, more idiosyncratic accent that, combined with the text in ancient Greek, conveys a modernist’s vision of a starkly elemental, nuance-averse ancient ritual.” (New York Times)