A vast audience received its first exposure to the music of György Ligeti through Stanley Kubrick's use of his haunting "Lux Aeterna" (despite the composer's lack of consent) in the film 2001: A Space Odyssey. This collection--part of Sony's invaluable Ligeti edition--places "Lux aeterna" in the context of Ligeti's other a cappella choral works, which together provide an overview of the evolving phases of one of the 20th century's most intriguing composers. In his booklet notes to the disc, Ligeti recalls the influence of Bartók and Kodály on his early folkloric compositions, from arrangements of traditional material to free, polyrhythmically inflected inventions on Hungarian folk texts, a format that allowed him some degree of experimental freedom from the strictures of "socialist realism" before he fled the Hungarian Communist regime. The breakthrough "Lux aeterna" is a classic example of Ligeti's trademark technique of "micropolyphony," enveloping the listener in mesmerizingly dense textures of cloudlike harmonies. From Ligeti's late period comes a triptych of "Hölderlin Phantasies." Their 16-voice polyphony transcends the simplistic distinction between tonality and atonality to explore "new kinds of half diatonic, half chromatic harmonies." The resulting sound world of fragmentary, dislocated epiphanies mirrors the unfathomable richness of the great visionary poet to uncanny effect. Throughout, the acoustical balance and conviction of the London Sinfonietta Voices give vivid shape to Ligeti's genius. -Thomas May