A fiercely confrontational avant-garde performer noted for her wailing, four-octave vocal range, Diamanda Galás has received momentous acclaim for her harrowing, politically charged works. Drawing from German expressionism as well as the traditions of blues, gospel, and country, among many other forms, her work addresses subjects such as mental illness, injustice, and suffering. A longtime activist, she has addressed the AIDS crisis in works such as her trilogy Masque of the Red Death, composed in 1986, and 1991's Plague Mass, the first of her numerous live recordings. The Spo...