He utilized his own concept of permeability in a work for orchestra that eschews a traditional melody in favor of sounds that appear not to progress in time, while he showcased micropolyphony in a work composed for sixteen voices.  
This composer used the text of Louis Carroll poetry in "Two Dreams and Little Bat," which, along with "Lobster Quadrille" is included in a set of works that he composed for the King's Singers, his Nonsense Madrigals. For performer Rena Denes, he added a Capriccio movement to form his Cello Sonata in D. Each of the eleven piano pieces adds an additional pitch class in his Musica ricercata, while Nekrotzar appears in his only opera, a work set in Breughelland called (*) Le Grand Macabre.  He utilized his own concept of permeability in a work for orchestra that eschews a traditional melody in favor of sounds that appear not to progress in time, while he showcased micropolyphony in a work composed for sixteen voices.  For 10 points, name this Hungarian composer of Atmospheres and Lux Aeterna, whose music was used by Stanley Kubrick in 2001: A Space Odyssey.
This composer used the text of Louis Carroll poetry in "Two Dreams and Little Bat," which, along with "Lobster Quadrille" is included in a set of works that he composed for the King's Singers, his Nonsense Madrigals.
Gyorgy Ligeti