Shrieking, keening, wailing, gnashing, cooing: Diamanda Galas sings avant-garde arias to the damned. With a startling, three-and-a-half octave range and a disturbing array of imagery, the Greek-American vocalist and pianist vivifies worlds of anguish, pain, persecution, suffering, cruelty, and redemption. Her work addresses AIDS, genocide, and terror unflinchingly, with a self-righteous rage that few can match; yet she also tackles standards from the sorrowful albums of raw Americana, making them her own. Insistently, for three decades, she has attacked the duplicitous and empathized with the victimized. The female anti-Virgil in a Hell on Earth, Diamanda Galas offers a narrative that both reaches catharsis and shreds carotid arteries.